MGU Social Science Series — Economics: Principles of Microeconomics and Macroeconomics
Part VII: International and Applied Economics
Trade · Exchange Rates · Tariffs · Globalization
Chapter 29 of 30
MGU Social Science Series  ·  Economics: Principles of Microeconomics and Macroeconomics  ·  Library Textbook Edition

Chapter 29:
International Trade,
Exchange Rates, and
Globalization

Comparative advantage across borders, tariffs and quotas, exchange rates, global supply chains, and the distributional tradeoffs of an interconnected world economy

■ Part VII: International and Applied Economics ■

■ 10 Sections  •  Chapter 29 of 30 ■

Builds on Chapter 5 (Trade, Specialization, and Comparative Advantage)  ·  Prepares students for Chapter 30

Chapter 29 — Front Matter

Chapter Introduction

Every morning, millions of people interact with the global economy before they even leave their homes. The coffee in a morning cup may have been grown in Ethiopia, roasted in Germany, and sold by a company headquartered in the United States. The smartphone on the nightstand may contain chips designed in California, manufactured in Taiwan, assembled in China, and shipped through ports in South Korea. The shirt hanging in the closet may have been sewn from cotton grown in India, spun into fabric in Bangladesh, and distributed through a logistics network spanning four continents.

This is not an accident. It is the product of comparative advantage, voluntary exchange, specialization, and the institutions—trade agreements, exchange rate systems, ports, shipping networks, financial markets—that make international commerce possible.

Chapter 29 brings together the microeconomic and macroeconomic reasoning developed throughout this textbook and applies it to the global economy. Students will learn why countries trade, how prices adjust across borders, what exchange rates are and why they matter, and how trade policy shapes winners and losers. They will also learn that international economics is not simply economics applied to larger maps. Trade across national borders involves currency conversion, political decisions, distributional consequences, and adjustment costs that purely domestic markets do not.

Opening Question

By the end of this chapter, students should be able to explain why countries export and import, calculate comparative advantage in a trade context, analyze the effects of tariffs and quotas, read exchange rate tables, reason through appreciation and depreciation, understand what global supply chains are and how they work, and evaluate trade policy debates using economic reasoning rather than slogans.

10Sections
30Key Terms
4Graphs
39Practice Questions

Learning Objectives

  1. 1Explain why countries trade using the principle of comparative advantage rather than absolute advantage.
  2. 2Define exports, imports, and the trade balance, and calculate trade surpluses and deficits from data.
  3. 3Calculate comparative advantage in a two-country, two-good trade scenario and identify mutually beneficial terms of trade.
  4. 4Analyze the effects of tariffs and quotas on price, quantity, consumer and producer surplus, government revenue, and deadweight loss.
  5. 5Distinguish bilateral, regional, and multilateral trade agreements, and explain trade creation versus trade diversion.
  6. 6Read and interpret exchange rate tables and convert prices between currencies.
  7. 7Explain appreciation and depreciation and their effects on exports, imports, and the trade balance.
  8. 8Describe global supply chains and explain why they create both efficiency gains and vulnerabilities.
  9. 9Evaluate the distributional effects and adjustment costs of globalization using evidence rather than slogans.
  10. 10Separate positive and normative claims in trade policy debates and identify efficiency-versus-distribution tradeoffs.
Chapter 29 — Contents

Sections at a Glance

Sections 29.1 – 29.4
Why Nations Trade and How We Measure It
Comparative Advantage Across Borders · Imports and Exports · Trade Balances
Section 29.1

Why Countries Trade

Why does Japan import wheat from the United States? Why does the United States import electronics from South Korea? Why does Germany export automobiles to countries that manufacture their own cars?

The answer comes from a principle introduced in Chapter 5: comparative advantage. Countries—like individuals and firms—can benefit from specialization and exchange even when one country is more productive than another at producing everything. What matters is not absolute productivity but relative opportunity cost.

Recall from Chapter 5 that when two parties have different opportunity costs, they can both gain by specializing in the good where their opportunity cost is lower and trading for the good where their opportunity cost is higher. This same logic applies to nations. If France can produce wine at a lower opportunity cost than Germany, and Germany can produce precision machinery at a lower opportunity cost than France, then both countries gain by specializing and trading. Both countries consume outside their own production possibilities.

Why Opportunity Costs DifferDescriptionExample
Factor endowmentsRelative abundance of land, labor, capital, and natural resourcesBrazil's land suited to coffee and soybeans; Saudi Arabia's petroleum reserves
Technology and human capitalAccumulated knowledge, technical skill, and production methodsEducated workforces with lower opportunity costs in knowledge-intensive industries
Economies of scaleCosts fall as output rises when production has large fixed costsLarge-scale aircraft, semiconductor, and pharmaceutical industries
Historical and institutional factorsPast investment, industry clusters, and supply chain networksEstablished manufacturing hubs that persist beyond current cost advantages
Trade Expands Consumption Possibilities

Trade expands what a country can consume beyond what it can produce. A country can specialize in goods where it has comparative advantage, export those goods, and use the export revenue to import goods it does not produce efficiently. This is why even large, diversified economies—the United States, Germany, Japan, China—engage heavily in trade. Trade is not a sign of economic weakness; it is a mechanism for increasing total production and consumption.

Practice 29.1Concept Check
  1. In your own words, explain why comparative advantage—not absolute advantage—determines the direction of mutually beneficial trade.
  2. List two reasons why opportunity costs might differ between two countries producing the same two goods.
  3. Why can a country consume outside its own production possibilities frontier if it trades?
  4. A student says, "Trade deficits prove a country is weak." Write a two-sentence response using ideas from this section.
Section 29.2

Imports and Exports

Exports are goods and services produced domestically and sold to buyers in other countries. Imports are goods and services produced in other countries and purchased by domestic buyers. Both goods and services—transportation, finance, tourism, education, consulting, software—can be traded internationally, and services trade is growing rapidly relative to goods trade in many developed economies.

Total trade is often measured as exports plus imports, expressed in dollar value or as a percentage of GDP. Countries with high trade-to-GDP ratios—Singapore, Belgium, the Netherlands, South Korea—are sometimes called open economies. Countries with lower ratios are said to be more closed. The United States has a relatively moderate trade-to-GDP ratio because of its large domestic market; many smaller European countries have higher ratios because of regional economic integration.

The Trade Balance

Trade Balance = Exports − Imports

When exports exceed imports, a country runs a trade surplus. When imports exceed exports, a country runs a trade deficit. Trade deficits are not automatically bad, and trade surpluses are not automatically good—the meaning depends on economic context.

CountryExports (billions)Imports (billions)Trade Balance
Country A$500$420+$80 (surplus)
Country B$300$380−$80 (deficit)
Country C$650$650$0 (balanced)
Bilateral vs. Multilateral Trade

A country may run a surplus with some trading partners and a deficit with others. The bilateral trade balance measures the balance between two specific countries. The multilateral trade balance measures the total across all partners. A bilateral trade deficit with a specific country is not always economically meaningful—a household does not expect to run a balanced "trade account" with every store it shops at. What matters economically is the overall pattern.

Practice 29.2Imports, Exports, and Trade Balances
  1. Define exports and imports in your own words.
  2. Calculate the trade balance: exports $720B, imports $690B.
  3. Calculate the trade balance: exports $410B, imports $505B.
  4. Is a high trade-to-GDP ratio always a sign of weakness? Explain.
  5. Explain the difference between a bilateral and a multilateral trade balance.
  6. Why might a bilateral trade deficit with one country be economically unimportant?
Section 29.3

Comparative Advantage in International Trade

Comparative advantage—introduced in Chapter 5—is the foundation of trade theory. It explains why mutually beneficial trade is possible even when one country is more productive in absolute terms. A country has a comparative advantage in producing a good if it can produce that good at a lower opportunity cost than its trading partner.

Wheat (bushels per worker)Cloth (yards per worker)
Northland105
Southland64
Example 29.3.1
Calculating comparative advantage between Northland and Southland
  • Step 1Opportunity cost of wheat in Northland: 5/10 = ½ yard of cloth per bushel. In Southland: 4/6 = ⅔ yard of cloth per bushel.
  • Step 2Opportunity cost of cloth in Northland: 10/5 = 2 bushels of wheat per yard. In Southland: 6/4 = 1.5 bushels of wheat per yard.
  • Step 3Northland's opportunity cost of wheat (½) is lower than Southland's (⅔) → Northland has comparative advantage in wheat.
  • Step 4Southland's opportunity cost of cloth (1.5) is lower than Northland's (2) → Southland has comparative advantage in cloth.
  • ConclusionNorthland should specialize in and export wheat; Southland should specialize in and export cloth—even though Northland is absolutely more productive in both goods (10 > 6 wheat, 5 > 4 cloth).
Key takeaway: Absolute advantage in both goods does not eliminate the gains from trade. Comparative advantage does.
Terms of Trade

The terms of trade are the actual prices at which countries exchange goods. For trade to benefit both parties, the terms of trade must fall between the two countries' domestic opportunity costs—in this example, between ½ and ⅔ yard of cloth per bushel of wheat.

Limits of the Simple Model

Real trade involves many countries and millions of goods. Comparative advantage shifts over time as technology, skills, and factor endowments change. Trade has distributional effects—some groups gain, others face adjustment costs. Strategic considerations (defense, supply chain security, food security) sometimes lead governments to support industries regardless of comparative advantage. These complications do not invalidate the framework; they remind students that economic models are tools for reasoning, not perfect descriptions of reality.

Practice 29.3Comparative Advantage Calculations
  1. Country M produces 12 units of corn or 6 units of steel per worker. Country N produces 8 units of corn or 2 units of steel per worker. Calculate opportunity costs and identify comparative advantage in each good.
  2. Using your answer above, identify a feasible range of terms of trade between corn and steel.
  3. Explain why a country that is more productive in both goods can still benefit from trade.
Section 29.4

Trade Balances

A country's trade balance reflects the difference between what it sells abroad and what it buys from abroad. But the trade balance is not just an accounting entry—it is connected to the broader macroeconomy through saving, investment, and international capital flows.

The Saving-Investment Connection

Trade Balance ≈ National Saving − Domestic Investment

When a country saves more than it invests domestically, the surplus saving flows abroad and the country runs a trade surplus. When a country invests more than it saves domestically, it attracts foreign capital and tends to run a trade deficit. A country cannot eliminate a trade deficit simply by imposing tariffs on one country if the underlying saving-investment imbalance remains.

Resist Simple Narratives

"Trade deficits mean we are losing." Not necessarily—deficits can reflect high consumer demand and attractive investment opportunities. "Trade surpluses always mean strength." Not necessarily—a surplus may reflect weak domestic consumption. "Every country should have balanced trade." Not generally true—capital flows naturally create imbalances. What matters is whether imbalances are sustainable and what they reflect about underlying economic conditions.

Practice 29.4Trade Balance Reasoning
  1. Explain the saving-investment connection to the trade balance in your own words.
  2. Why might a tariff on one trading partner fail to reduce a country's overall trade deficit?
  3. Give one reason a trade deficit could coincide with a strong economy, and one reason a trade surplus could coincide with a weak economy.
Sections 29.5 – 29.8
Trade Policy, Agreements, and Currency Markets
Tariffs and Quotas · Trade Agreements · Exchange Rates · Appreciation and Depreciation
Section 29.5

Tariffs and Quotas

Even when trade is mutually beneficial in aggregate, governments frequently intervene in trade. The two most common tools of trade policy are tariffs and quotas. A tariff is a tax on imported goods, collected by the government of the importing country when goods cross the border.

Effects of a Tariff

Suppose the United States imposes a tariff on imported steel. The tariff raises the price of imported steel in the U.S. market: domestic steel producers benefit from higher prices and sell more; domestic steel consumers lose, paying higher prices; the government collects tariff revenue equal to the tariff rate multiplied by the quantity imported; and a deadweight loss arises because resources are used to produce steel domestically that could have been imported more cheaply.

Price │ │ Domestic Supply │ / Pt│─────/────────────── │ / │ │ \ Pw│───/─────│────│─────\──── World Price │ / │ │ \ │ / │ │ \ │/ │ │ \ └──────────────────────────── Quantity Q1 Q2 Q3 Q4 Pw = world price (free trade price) Pt = tariff-inclusive price Q1–Q2: domestic production (gains for producers) Q2–Q3: imports after tariff (reduced from Q4–Q1 under free trade) Government collects tariff revenue on imports (Q3 − Q2) × (Pt − Pw) Triangles on either side of revenue rectangle = deadweight loss
Who Really Pays the Tariff?

Tariff incidence matters: in most cases, domestic consumers bear a substantial share of the cost through higher prices, even though importers formally pay the tariff at the border. In some cases, foreign exporters absorb part of the cost by lowering prices to maintain market share.

Quotas and Other Trade Barriers

A quota is a legal limit on the quantity of a good that can be imported. Restricting imports raises the domestic price above the world price, similar to a tariff. Domestic producers benefit; domestic consumers pay higher prices. Unlike a tariff, a quota does not generate government revenue (unless import licenses are auctioned)—the value that would have been tariff revenue instead flows to whoever holds the right to import, often foreign exporters or domestic license holders. Quotas can be harder to administer and do not automatically let more goods in if demand rises.

Other trade barriers include subsidies to domestic producers, regulatory barriers (sanitary standards, labeling requirements), local content requirements, and antidumping duties.

Argument for ProtectionismReasoningKey Limitation
Infant industryNew domestic industries may need temporary protection to scale and become competitiveDifficult to identify which industries deserve protection and when to remove it
National securitySome industries are essential for defense or crisis resilienceCan be used to justify protection well beyond genuinely strategic goods
Job protectionProtection saves jobs in threatened industries in the short runComes at the cost of higher prices for consumers and potentially fewer jobs elsewhere
Retaliation and bargainingTariff threats can pressure partners to open markets or reduce subsidiesRisk of escalating trade conflict and retaliation
FairnessResponds to subsidies or currency manipulation by trading partnersHard to verify and easy to overstate
Example 29.5.1
Calculating tariff effects on steel
  • SetupWorld price of steel = $400/ton. Domestic supply = 1,000 tons; domestic demand = 4,000 tons at $400. A $100 tariff raises price to $500; domestic supply rises to 1,500 tons; domestic demand falls to 3,200 tons.
  • Imports before4,000 − 1,000 = 3,000 tons
  • Imports after3,200 − 1,500 = 1,700 tons
  • Tariff revenue1,700 tons × $100 = $170,000
  • DistributionProducers gain (500 more tons sold at a $100 higher price); consumers lose (paying $100 more on 3,200 tons); deadweight loss arises from the inefficient 500-ton domestic increase and the 800 tons of lost consumption.
Key takeaway: A tariff redistributes income from consumers to producers and government, while shrinking total economic surplus.
Practice 29.5Tariffs and Quotas
  1. World price of furniture = $200/unit. Domestic supply at $200 = 300 units; demand = 800 units. After a $50 tariff (price = $250), supply = 400, demand = 650. Find imports before and after, tariff revenue, and explain who gains and loses.
  2. Compare a tariff and a quota that both reduce imports by the same amount. Which generates government revenue? Which does economists generally prefer, and why?
  3. Evaluate the national-security argument for a steel tariff. Identify two groups that benefit and two that lose.
Section 29.6

Trade Agreements

Trade agreements are formal arrangements between countries that set rules for trade—typically reducing or eliminating tariffs, establishing dispute-resolution procedures, and setting common standards for intellectual property, investment, labor, and environmental practices.

TypeDescriptionExample
BilateralAgreement between two countriesA U.S.–South Korea free trade agreement
RegionalAgreement among multiple countries in a geographic regionUSMCA; the European Union; ASEAN
MultilateralAgreement operating through international institutionsThe World Trade Organization (WTO), with 164 member countries
Free trade areaEliminates tariffs between members; each sets its own external tariffsMany regional free trade agreements
Customs unionEliminates internal tariffs and sets a common external tariffThe European Union
Trade Creation vs. Trade Diversion

Trade agreements can both create trade (replacing costly domestic production with cheaper imports from partner countries) and divert trade (shifting imports from a low-cost non-member country to a higher-cost member country because tariffs make non-member goods more expensive). Trade creation improves efficiency; trade diversion can reduce it.

Practice 29.6Trade Agreements
  1. Distinguish a free trade area from a customs union.
  2. A country joins a regional agreement. Trade with member Country A rises (A is cheaper than domestic production); trade with non-member Country B falls (B used to be cheapest, but the tariff now makes A appear cheaper). Identify the trade creation and the trade diversion. Which improves efficiency? Which may reduce it?
Section 29.7

Exchange Rates

When a U.S. company wants to import goods from Japan, it must pay in Japanese yen. The exchange rate is the price at which one currency trades for another. Exchange rates can be expressed as direct quotation (price of one unit of foreign currency in domestic currency, e.g., $1.10 per euro) or indirect quotation (price of one unit of domestic currency in foreign currency, e.g., €0.91 per dollar).

Currency PairExchange Rate
USD / EUR ($ per €)1.10
USD / GBP ($ per £)1.25
USD / JPY ($ per ¥)0.0067
USD / CNY ($ per ¥)0.14
Cross-Rates

To find euros per pound from the table above: 1.25 / 1.10 ≈ 1.14 euros per pound.

Nominal vs. Real Exchange Rates

Real Exchange Rate = Nominal Exchange Rate × (Domestic Price Level / Foreign Price Level)

The real exchange rate matters for trade competitiveness. If a country's prices rise faster than its trading partners', its real exchange rate appreciates even if the nominal rate is unchanged—making exports more expensive and imports cheaper.

Exchange rates in most major economies are determined by supply and demand in foreign exchange markets. Demand for a currency comes from foreigners who want to buy that country's goods, services, or assets. Supply comes from domestic residents who want to buy foreign goods, services, or assets. Relative interest rates, relative inflation, income levels, expectations, and central bank intervention all shift these curves.

$/€ │ │ S (euros) │ / │ / e*│─────────X───────── │ / \ │ / \ │ / D (euros) └──────────────────────── Quantity of Euros Q* D slopes downward: cheaper euros → U.S. buyers demand more S slopes upward: cheaper dollar → Europeans supply more euros e* = equilibrium exchange rate at quantity Q*
Practice 29.7Reading Exchange Rates
  1. Using the table: how many dollars does 1 pound cost? How many yen does 1 dollar buy?
  2. Calculate the cross-rate between yen and yuan using the table.
  3. Explain the difference between the nominal and real exchange rate, and why the distinction matters for trade competitiveness.
  4. List three factors that shift the demand for, or supply of, a currency in foreign exchange markets.
Section 29.8

Appreciation and Depreciation

When a currency's value rises relative to other currencies, it has appreciated. When it falls, it has depreciated. If the dollar moves from $1.00 per euro to $1.20 per euro, the euro has appreciated (it costs more dollars); equivalently, the dollar has depreciated.

Memory Aid

Appreciation = a currency buys more of another currency. Depreciation = a currency buys less.

ChangeEffect on ExportsEffect on ImportsEffect on Trade Balance
Currency appreciatesMore expensive for foreign buyers → exports fallCheaper for domestic buyers → imports riseMoves toward deficit (or surplus shrinks)
Currency depreciatesCheaper for foreign buyers → exports riseMore expensive for domestic buyers → imports fallMoves toward surplus (or deficit shrinks)
Example 29.8.1
Exchange rate conversion: a German camera
  • SetupA German camera costs €800. Exchange rate is 1.15 USD per euro.
  • Dollar price$800 × 1.15 = $920
  • After appreciationIf the dollar appreciates to 1.05 USD per euro: $800 × 1.05 = $840
  • InterpretationDollar appreciation makes the camera cheaper in dollar terms, which would tend to increase U.S. imports of German goods.
Key takeaway: Currency appreciation works like a price decrease for foreign goods bought with the appreciating currency.
Exchange Rate RegimeDescriptionExample
FloatingDetermined freely by supply and demandUnited States, United Kingdom, Japan, eurozone
Fixed (currency peg)Government commits to a specific value and intervenes to maintain itSeveral smaller economies
Managed floatMostly market-determined, with occasional intervention to smooth swingsChina, historically
Practice 29.8Appreciation, Depreciation, and Regimes
  1. The exchange rate is 110 yen per dollar. A U.S. video game costs $60. How many yen does it cost? If the dollar appreciates to 130 yen per dollar, how many yen does it cost? Is the game more or less expensive for Japanese buyers, and what is likely to happen to U.S. exports?
  2. The exchange rate is 1.20 USD per euro. A French handbag costs €400. Find the dollar price. The dollar then depreciates to 1.40 USD per euro—find the new dollar price and explain the effect on U.S. consumers and exporters.
  3. Explain one tradeoff between a floating exchange rate and a fixed exchange rate.
Sections 29.9 – 29.10
Supply Chains, Globalization, and Adjustment
Global Supply Chains · Globalization · Distributional Effects · Policy Tradeoffs
Section 29.9

Global Supply Chains

A supply chain is the sequence of steps involved in producing and delivering a product from raw materials to final consumer. In modern international trade, supply chains are often global—spread across many countries, each contributing a different stage of production. A modern aircraft may contain fuselage sections from Japan, engines from France and the UK, and panels from Italy.

DriverWhy It Mattered
Lower trade barriersReduced tariffs made it viable to move components across borders
Transportation technologyContainerized shipping cut the cost of moving goods across oceans
Information and communication technologyDigital coordination across continents in real time
Factor cost differencesLabor-intensive stages shifted to lower-wage countries; knowledge-intensive stages stayed in high-wage countries
Trade Statistics Can Mislead

If a U.S. smartphone contains components from South Korea, Japan, Germany, and China, assembled in China and exported to the United States, the full value of the phone may be counted as a Chinese export—even though much of the value was added elsewhere. Value-added trade measures try to capture how much value was actually produced in each country, and often show countries are more interdependent than bilateral balances suggest.

Resilience vs. Efficiency

The COVID-19 pandemic revealed supply chain vulnerabilities: when production concentrates in a few countries and a crisis disrupts those countries, supply chains can fail. Many governments have reconsidered the tradeoffs between efficiency and resilience as a result.

Practice 29.9Global Supply Chains
  1. Define a global supply chain and give an original example with stages in at least four countries.
  2. Explain why standard bilateral trade statistics can overstate or distort the trade relationship between two countries linked through global supply chains.
  3. Explain one tradeoff between supply chain efficiency and supply chain resilience.
Section 29.10

Globalization, Adjustment Costs, and Policy Tradeoffs

Globalization refers broadly to the increasing integration of economies, cultures, and societies across national borders—through trade, foreign direct investment, global supply chains, capital flows, migration, and the spread of technology and information. The pace of economic globalization accelerated sharply after World War II and especially after the 1980s.

Economic research provides substantial evidence that trade raises average living standards over time. South Korea moved from one of the world's poorest countries in the 1950s to a high-income economy, driven substantially by export-led growth. Economies that isolated themselves from trade have remained much poorer than their geographic neighbors. Lower prices for manufactured goods have benefited consumers globally, with particular gains for lower-income households.

Gains Are Real but Unequally Distributed

Trade tends to benefit factors of production used intensively in export industries and tends to hurt factors that compete with imports. In high-income countries, workers with high skills and education tend to gain as knowledge-intensive industries expand, while workers in import-competing manufacturing face wage pressure, layoffs, and plant closures—often concentrated in specific communities.

Adjustment costs are real: unemployment during transition, geographic immobility, and skills mismatch. Recent research—particularly on rapid import competition from China in the 2000s—has shown these costs can be substantial and persistent for affected workers and communities.

TradeoffDescription
Efficiency vs. distributionFree trade maximizes total output, but gains and losses are distributed unequally
Short run vs. long runProtection may save jobs short-term but encourages inefficiency; liberalization may cost jobs short-term but expands long-run possibilities
Domestic vs. global welfareTariffs may benefit domestic producers at the expense of domestic consumers and foreign exporters; governments answer to domestic voters
Security vs. efficiencyEfficient global production can create supply chain vulnerability; domestic production of critical goods may be worth an efficiency cost
Policy Responses to Adjustment Costs

Economists broadly favor allowing trade to proceed while compensating those who bear adjustment costs: trade adjustment assistance, education and retraining investment, place-based policies for affected communities, and progressive redistribution. Even well-designed assistance programs have had mixed records—retraining often does not fully replace lost wages, and workers displaced in their 40s and 50s face particularly difficult transitions. These realities argue for taking adjustment costs seriously, not for abandoning trade.

Practice 29.10Globalization and Adjustment
  1. Give one piece of evidence that trade has raised living standards over time.
  2. Explain why gains from trade can be real in aggregate but still produce concentrated losses for specific communities.
  3. List three types of adjustment costs that displaced workers may experience.
  4. Describe two policy tools that address adjustment costs without abandoning trade.
Chapter 29 — Back Matter

Chapter Summary

Key Terms Review

absolute advantage
The ability to produce more of a good per unit of input than a trading partner, regardless of opportunity cost.
appreciation
An increase in the value of a currency relative to other currencies; a given unit buys more foreign currency than before.
balance of payments
A record of all economic transactions between a country's residents and the rest of the world, including trade, income, and financial flows.
bilateral trade balance
The difference between exports to and imports from a specific trading partner.
comparative advantage
The ability to produce a good at a lower opportunity cost than a trading partner; the basis for mutually beneficial trade.
currency peg
A policy under which a government commits to maintaining its currency at a set value relative to another currency.
customs union
A trade agreement in which member countries eliminate tariffs among themselves and set a common external tariff.
deadweight loss
Efficiency loss from a market distortion such as a tariff or quota; the reduction in total surplus.
depreciation
A decrease in the value of a currency relative to other currencies; a given unit buys less foreign currency than before.
exchange rate
The price at which one currency trades for another.
exports
Goods and services produced domestically and sold to foreign buyers.
floating exchange rate
An exchange rate determined by supply and demand in foreign exchange markets without a government commitment to a specific value.
free trade area
A trade agreement in which members eliminate tariffs with each other but each sets its own tariffs toward non-members.
globalization
The increasing integration of national economies through trade, investment, capital flows, migration, and information exchange.
global supply chain
The sequence of production stages for a good, spread across multiple countries, each contributing a different input or process.
imports
Goods and services produced in other countries and purchased by domestic buyers.
managed float
An exchange rate system primarily determined by market forces, with occasional government intervention to smooth fluctuations.
multilateral trade agreement
A trade agreement involving many countries, typically negotiated through the World Trade Organization.
nominal exchange rate
The actual market rate at which currencies are exchanged.
protectionism
Government policies that restrict imports to protect domestic producers.
quota
A legal limit on the quantity of a good that can be imported.
real exchange rate
The nominal exchange rate adjusted for differences in price levels between countries.
tariff
A tax on imported goods collected by the government of the importing country.
terms of trade
The actual price ratio at which countries exchange goods in international markets.
trade adjustment assistance
Government programs providing income support, job training, and other assistance to workers displaced by import competition.
trade agreement
A formal arrangement between countries establishing rules, tariff levels, and procedures for international trade.
trade balance
Exports minus imports; positive when exports exceed imports (surplus), negative when imports exceed exports (deficit).
trade creation
The efficiency gain when a trade agreement leads countries to replace costly domestic production with cheaper imports from partner countries.
trade diversion
The efficiency loss when a trade agreement shifts imports from low-cost non-member countries to higher-cost member countries.
value-added trade
Trade measured by the value contributed by each country in a global supply chain, rather than the full value of the final good.
World Trade Organization (WTO)
The international institution that establishes and enforces rules governing trade among its member countries.

Graph Review

Graph 29.A — The Production Possibilities Frontier and Trade. Before trade, a country must consume on or inside its production possibilities frontier. After trade, a country can consume outside its frontier by specializing in comparative advantage goods and importing others.

Graph 29.B — Effect of a Tariff. Use a domestic supply and demand diagram for an imported good with a world price line below domestic equilibrium. Show the free-trade import quantity, then add a tariff and show the smaller import quantity, deadweight loss triangles, the government revenue rectangle, and the gain/loss areas for producers and consumers.

Graph 29.C — Supply and Demand in the Foreign Exchange Market. Exchange rate on the vertical axis, quantity of foreign currency on the horizontal axis. Demand for the foreign currency slopes downward; supply slopes upward. Show equilibrium, then appreciation (demand increase) and depreciation (supply increase).

Graph 29.D — Effect of a Quota. Similar to the tariff diagram, but show a quantity restriction limiting imports directly, the resulting domestic price above world price, the domestic production gain, the consumer loss, and the absence of government revenue (quota rents flow to import license holders instead).

Data Review

Table 29.1 — Comparative Advantage Practice

Computers (units per worker per day)Wheat (bushels per worker per day)
Country X84
Country Y36

Calculate the opportunity cost of computers and wheat for each country. Identify comparative advantage in each good. Determine the feasible range of terms of trade.

Table 29.2 — Trade Balance Data

YearExports ($B)Imports ($B)Trade Balance ($B)
Year 1850790+60
Year 2900880+20
Year 3870960−90
Year 4920980−60

Identify surplus and deficit years. Describe the trend. Explain why a single deficit year does not automatically indicate economic weakness.

Table 29.3 — Exchange Rate Table

CurrencyUnits per U.S. Dollar
Euro (€)0.92
British Pound (£)0.79
Japanese Yen (¥)149.50
Canadian Dollar (C$)1.36
Mexican Peso (MXN)17.10

Practice: How many dollars does 1 euro cost? How many yen does 1 dollar buy? Calculate the cross-rate between euros and pounds.

Worked Example Review

Worked Example 29.1
Calculating Comparative Advantage — Canada and Mexico
  • SetupCanada: 20 lumber or 5 automobiles per worker per day. Mexico: 8 lumber or 4 automobiles per worker per day.
  • Step 1Canada's opportunity cost of lumber = 5/20 = ¼ automobile
  • Step 2Mexico's opportunity cost of lumber = 4/8 = ½ automobile
  • Step 3Canada's lower cost (¼ < ½) → Canada has comparative advantage in lumber.
  • Step 4Canada's opportunity cost of autos = 20/5 = 4 lumber; Mexico's = 8/4 = 2 lumber
  • Step 5Mexico's lower cost (2 < 4) → Mexico has comparative advantage in automobiles.
Conclusion: Canada exports lumber; Mexico exports automobiles. Mutually beneficial terms of trade lie between ¼ and ½ automobile per unit of lumber.
Worked Example 29.2
Exchange Rate Conversions — A German Camera
  • SetupExchange rate 1.15 USD per euro; camera costs €800.
  • At 1.15$800 × 1.15 = $920
  • At 1.05$800 × 1.05 = $840
Conclusion: Dollar appreciation makes the camera cheaper in dollar terms, tending to increase U.S. imports from Germany.
Worked Example 29.3
Tariff Effects on the Steel Market
  • SetupWorld price $400/ton; domestic supply 1,000, demand 4,000 at $400. After a $100 tariff (price $500), supply = 1,500, demand = 3,200.
  • Imports before4,000 − 1,000 = 3,000 tons
  • Imports after3,200 − 1,500 = 1,700 tons
  • Tariff revenue1,700 × $100 = $170,000
Conclusion: Producers gain, consumers lose, and deadweight loss arises from inefficient added domestic production plus lost consumption.

Concept Check

  1. What is the difference between absolute advantage and comparative advantage?
  2. If a country's currency appreciates, what happens to the price of its exports for foreign buyers?
  3. How does a tariff differ from a quota in its effect on government revenue?
  4. What is a trade deficit, and does it automatically indicate economic weakness?
  5. Why do global supply chains create both efficiency gains and vulnerabilities?

Practice Questions

Section A: Vocabulary in Context

  1. A U.S. aerospace company sells commercial aircraft to airlines in Singapore and Australia. These sales are counted as U.S. ______. The foreign airlines purchasing the aircraft are generating ______ for their home countries.
  2. The U.S. government imposes a 25 percent ______ on imported washing machines. A foreign government responds by limiting U.S. soybean imports to 500,000 units per year, which is an example of a ______.
  3. When the Japanese yen buys more U.S. dollars than it did last year, the yen has ______. This makes Japanese goods ______ expensive for U.S. buyers and U.S. goods ______ expensive for Japanese buyers.
  4. Country A and Country B eliminate tariffs on trade between each other but both agree to charge the same tariff rate on goods from all other countries. This arrangement is called a ______.
  5. Workers who lose their jobs when a domestic factory closes because it cannot compete with lower-priced imports may be eligible for ______ to help them find new employment or retrain for different careers.

Section B: Comparative Advantage Problems

  1. Two countries—Arcadia and Borealia—produce fish and timber. Per labor-hour, Arcadia produces 12 fish or 3 timber; Borealia produces 8 fish or 4 timber.
    1. What is the opportunity cost of one fish in each country?
    2. What is the opportunity cost of one unit of timber in each country?
    3. Which country has comparative advantage in fish? In timber?
    4. Which good should Arcadia export? What terms of trade would benefit both countries?
  2. A small country produces 100 clothing or 50 electronics per worker per year; its partner produces 60 clothing or 30 electronics.
    1. Calculate opportunity costs for each good in each country.
    2. Which country has comparative advantage in each good?
    3. Explain why comparative advantage, not absolute advantage, determines the direction of trade.
  3. Country M's opportunity cost of wheat is 2 units of cloth; Country N's is 3 units of cloth.
    1. Which country has comparative advantage in wheat?
    2. Which has comparative advantage in cloth?
    3. Identify a terms-of-trade ratio allowing mutually beneficial exchange.

Section C: Exchange Rate Problems

  1. The exchange rate is 110 yen per dollar. A U.S. video game costs $60.
    1. How many yen does the game cost a Japanese buyer?
    2. If the dollar appreciates to 130 yen per dollar, how many yen does the game cost?
    3. Has the game become more or less expensive for Japanese buyers? What is likely to happen to U.S. exports?
  2. The exchange rate is 1.20 USD per euro. A French handbag costs €400.
    1. What is the dollar price for a U.S. buyer?
    2. The dollar depreciates so 1 euro costs $1.40. What is the new dollar price?
    3. How does dollar depreciation affect U.S. consumers buying European goods, and U.S. exporters selling to Europe?
  3. The exchange rate between the Canadian dollar and U.S. dollar is 1.30 C$ per U.S. dollar.
    1. How much does a $500 U.S. computer cost in Canadian dollars?
    2. How much does a C$780 Canadian ski jacket cost in U.S. dollars?
    3. If Canada experiences higher inflation than the U.S. and the nominal rate stays fixed, what happens to the real exchange rate and Canada's trade competitiveness?

Section D: Tariff and Quota Analysis

  1. Imported furniture: world price $200/unit; domestic supply at $200 = 300 units, demand = 800 units. After a $50 tariff (price $250): supply = 400, demand = 650.
    1. How many units were imported before and after the tariff?
    2. How much tariff revenue does the government collect?
    3. Who gains from the tariff? Who loses?
    4. Explain why there is a deadweight loss.
  2. Compare a tariff and a quota that both reduce textile imports from 500,000 to 300,000 units per year, producing the same price increase.
    1. Which policy generates government revenue? Which does not?
    2. Who captures the value of the import restriction under each policy?
    3. If import demand grows, which policy automatically allows more imports? Explain.
    4. Which policy do economists tend to prefer as a trade restriction, and why?
  3. A government proposes a steel tariff on national security grounds.
    1. Explain the national security argument in economic terms.
    2. Identify two groups that benefit and two that lose.
    3. What is the efficiency cost of a tariff versus a domestic subsidy to achieve the same security goal?
    4. Does the national security argument justify the tariff? What additional information would help evaluate this claim?

Section E: Global Trade and Globalization

  1. Define a global supply chain. Give an original example of a product involving production stages in at least four countries, and explain each country's contribution.
  2. Why might bilateral trade statistics overstate or distort the trade balance between two countries linked through global supply chains?
  3. A country joins a regional free trade agreement. Trade with member Country A expands because A's goods are cheaper than domestic production. Trade with non-member Country B (previously cheaper) falls because the tariff makes A's goods appear cheaper.
    1. Identify the trade creation and trade diversion.
    2. Which effect improves global efficiency? Which may reduce it?
    3. What additional information would help evaluate whether joining improves overall welfare?
  4. A manufacturing worker earning $55,000 loses her job when her employer moves production overseas. After 18 months, she finds a job paying $40,000.
    1. What is the adjustment cost in this scenario?
    2. Is this consistent with the claim that trade increases average national income? Explain.
    3. What policies might reduce adjustment costs for workers like her?
    4. Should adjustment costs change your view of whether free trade is good for the country overall? Explain using the positive/normative distinction.

Economic Reasoning Questions

  1. A politician argues: "We have a $500 billion trade deficit with Country X. We should impose tariffs on Country X until they buy as much from us as we buy from them." Evaluate using economic reasoning: What determines the trade balance? Can tariffs on one country eliminate the overall deficit? Who bears the cost?
  2. A country with a floating exchange rate and independent monetary policy considers joining a currency union, giving up independent monetary policy. Identify at least three tradeoffs that should guide this decision.
  3. Economist A says free trade always increases total national income and is therefore right policy. Economist B says free trade raises average income but creates winners and losers and requires careful attention to distribution. Is Economist A making a positive claim, a normative claim, or both? Is Economist B's critique a reason to oppose trade or to accompany it with other policies?
  4. A country has comparative advantage in a commodity subject to volatile world prices and dwindling natural supply. Should it specialize and trade, or diversify even at higher-than-world-market cost? Use opportunity cost, risk, short-run vs. long-run tradeoffs, and adjustment costs to structure your answer.

Policy Scenario Questions

Scenario 1
A New Tariff on Imported Automobiles

A government announces a 25 percent tariff on imported automobiles to protect domestic automakers and their workers.

  1. Identify the groups that benefit and the mechanism by which they gain.
  2. Identify the groups that are harmed and the mechanism by which they lose.
  3. Explain deadweight loss in this context and why the tariff reduces total efficiency.
  4. The domestic auto industry employs 200,000 workers, but 10 million households buy automobiles. How should this affect your evaluation?
  5. Suppose a competing country retaliates with tariffs on agricultural exports. How does this change your analysis?
  6. Distinguish positive claims (what the tariff will do) from normative claims (whether it is good policy).
Scenario 2
A Country Considers Joining a Trade Agreement

A developing country is invited to join a regional free trade agreement with three more developed economies. Analysis suggests the agreement will increase exports by 15%, reduce consumer goods prices 8–12%, close several uncompetitive domestic plants, and attract new foreign direct investment.

  1. Identify the likely winners.
  2. Identify the likely losers.
  3. What adjustment costs should policymakers anticipate?
  4. What policies might accompany the agreement to address adjustment costs?
  5. Is the evidence sufficient to decide whether the country should join? What else would you want to know?
Scenario 3
Currency Appreciation and Export Competitiveness

A country's exchange rate appreciates significantly because foreign investors are purchasing its government bonds due to high interest rates.

  1. Explain how appreciation affects export competitiveness.
  2. Which industries are most likely to be hurt? Which might benefit?
  3. The central bank considers cutting rates to reduce appreciation. What are the tradeoffs?
  4. Exporters lobby for intervention to weaken the currency. Evaluate this argument.

Error Analysis

Identify the error in each statement and explain the correct economic reasoning.

  1. "Our country has a trade deficit with Country Z, so we are losing in our trade relationship with them. Our money is flowing out and never coming back."
  2. "A tariff is free money for the government. It makes foreign companies pay for the privilege of selling in our market."
  3. "Country A has absolute advantage in producing both wheat and cloth. Therefore, there is no basis for trade between Country A and Country B."
  4. "When the dollar depreciates, it is bad for the United States because everything becomes more expensive."
  5. "Free trade agreements just eliminate trade barriers. They cannot have any negative effects on any group within a country."
  6. "Trade deficits must be eliminated because they represent money leaving the country that is never returned."

Real-World Applications

  1. Research the U.S. trade balance for the most recent year available. What are the largest export and import categories? Does the pattern seem consistent with comparative advantage?
  2. Find the current exchange rate between the U.S. dollar and the euro, yen, pound, and yuan. Compare to rates from one year ago. Has the dollar appreciated or depreciated against each, and what factors might explain the changes?
  3. Find the WTO's most recent data on world merchandise trade. Which regions are the largest exporters and importers? Has the share of developing economies in global trade grown or shrunk recently?
  4. Research one specific product—a smartphone, a car, a pair of jeans, a cup of coffee—and trace its global supply chain. Where are major inputs produced? Where is final assembly? Where are design and IP functions located?
  5. Research how the COVID-19 pandemic disrupted one industry's supply chain (pharmaceuticals, PPE, or semiconductors). How have governments and firms responded? What tradeoffs are involved in building more resilient supply chains?

Mixed Review

  1. (Chapter 5 connection) Explain the difference between absolute and comparative advantage, and why comparative advantage determines the direction of mutually beneficial trade.
  2. (Chapter 8 connection) How do exchange rate changes function like price changes in coordinating international markets? Trace the sequence of adjustments after a dollar depreciation.
  3. (Chapter 9 connection) If demand for imports is inelastic, does a tariff raise or lower total consumer spending on imports? Who bears more of the tariff burden?
  4. (Chapter 18 connection) Compare a tariff and a domestic producer subsidy that both raise domestic production of a good, in terms of who pays, who benefits, efficiency costs, and effects on consumers.
  5. (Chapter 23 connection) How does a large currency depreciation function like an expansionary demand shock in the AD-AS model? Explain effects on exports, imports, output, employment, and inflation in the short run.
  6. (Chapter 27 connection) If a government runs a large budget deficit, how might this affect the trade balance? Use the saving-investment relationship to explain.

Chapter 29 Checkpoint

Chapter 29 Checkpoint
International Trade and Globalization — Complete without assistance; assesses all key skills and concepts from Chapter 29
Section 1 — Vocabulary and Concepts
  1. Define comparative advantage. Why does it, rather than absolute advantage, determine the direction of mutually beneficial trade?
  2. Define the trade balance. Why are trade deficits and surpluses not automatically good or bad?
  3. Explain how a tariff and a quota differ in their effect on government revenue and on who captures the value of the import restriction.
  4. Define appreciation and depreciation. How does each affect a country's exports and imports?
Section 2 — Calculation
  1. Country P produces 10 textiles or 5 machinery per worker; Country Q produces 6 textiles or 4 machinery per worker. Calculate opportunity costs and identify comparative advantage in each good.
  2. The exchange rate is 1.18 USD per euro. An Italian leather bag costs €250. Find the dollar price. If the dollar depreciates to 1.30 USD per euro, find the new dollar price and explain the effect on U.S. buyers.
Section 3 — Analysis
  1. A government imposes a tariff on imported bicycles. Identify who gains, who loses, and why a deadweight loss results.
  2. A student says, "If the dollar gets stronger, that's always good for the U.S. economy." Evaluate this claim using the concepts of appreciation, exports, and imports.
Section 4 — Applied Practice
  1. Choose a product you use regularly. Describe what its global supply chain might look like, identifying at least three countries and what each likely contributes.
  2. Describe a real or hypothetical trade policy decision (a tariff, a trade agreement, an exchange rate intervention). Identify the winners, the losers, and at least one adjustment cost policymakers should anticipate.
Section 5 — Ethics and Policy Judgment
  1. A country's trade policy raises aggregate national income but concentrates job losses in a few manufacturing communities. Using the positive/normative distinction, explain why economists might still support the policy while also supporting assistance for affected workers.
Looking Ahead
Chapter 30: Economics, Society, and Public Decision-Making

Chapter 30, the capstone chapter of this textbook, brings together the reasoning tools developed across all seven parts—opportunity cost, incentives, marginal thinking, market analysis, market failure, macroeconomic measurement, policy evaluation, and international economics—and applies them to broad questions of public decision-making. It revisits the distinction between positive and normative economics, examines how economic reasoning applies to environmental decisions, education, healthcare, technology, inequality, and global cooperation, and asks how students should use economic knowledge responsibly as citizens, workers, and decision-makers. The key lesson of Chapter 29 to carry forward: trade involves real tradeoffs. Markets for goods and currencies coordinate enormous amounts of international economic activity, but coordination does not mean that outcomes are equally good for everyone. Understanding who gains, who loses, and why is an essential part of economic literacy—and of good citizenship.

MGU Library Connection
  • Comparative Advantage Guide — Companion Resource referenced in Chapter 5
  • Exchange Rates Guide — Companion Resource for this chapter
  • International Trade Guide — Companion Resource for this chapter
  • Chapter 5: Trade, Specialization, and Comparative Advantage — foundational material extended here
  • Chapter 30: Economics, Society, and Public Decision-Making — capstone chapter that follows
  • Appendix J: International Economics Reference — full textbook back matter
  • MGU Dictionary entries: comparative advantage, tariff, quota, exchange rate, globalization