Chapter 19 — Front Matter
Chapter Introduction
Every economy produces output, income, and wealth. But it does not distribute them evenly. Some households earn many times what others earn. Some accumulate assets across generations. Others struggle to meet basic needs. Understanding why this happens, what it means, and what can be done about it requires careful economic reasoning.
This chapter studies income distribution, wealth distribution, poverty measurement, income inequality, economic mobility, and the causes and consequences of these patterns. It asks students to look at evidence, reason through mechanisms, separate facts from values, and think clearly about policy tradeoffs.
Economics does not dictate how much inequality is acceptable. That is a normative question involving values. But economics does provide tools to measure distribution, identify causes, trace consequences, and evaluate policy options. Both careful measurement and honest reasoning about tradeoffs are essential here.
10Sections
9Learning Goals
21Key Terms
5Misconceptions
Chapter Learning Goals
- 1Explain why distribution of income and wealth matters as an economic and social question.
- 2Distinguish income from wealth and describe how each is measured.
- 3Define and calculate absolute and relative poverty measures.
- 4Read and interpret a Lorenz curve.
- 5Understand the Gini coefficient as a summary measure of inequality.
- 6Describe what economic mobility means and how it is measured.
- 7Identify major causes of poverty and inequality.
- 8Explain consequences of high inequality for economic systems.
- 9Evaluate policy tools designed to address poverty and inequality, including their tradeoffs.
Sections 19.1 – 19.4
Distribution, Income, Wealth, and Poverty
Why Distribution Matters · Income and Wealth · Measuring Poverty · Absolute and Relative Poverty
Section 19.1
Why Distribution Matters
When economists study an economy, they often begin with totals: total output, total income, total employment, total price level. These aggregate measures describe how the economy is performing overall. But aggregate measures can obscure something important: how the economy's output and income are distributed among the people who make up that economy.
Consider two hypothetical economies, each with a population of ten people and a total income of $100,000 per year. Economy A: each person earns $10,000 — income is perfectly equal. Economy B: one person earns $55,000, and the other nine share $45,000, averaging $5,000 each. Both economies have the same total income, but they are very different places to live, especially for people at the bottom.
Distribution matters because people's access to food, housing, healthcare, education, transportation, and economic security depends not just on how much an economy produces, but on how production and income are shared.
| Dimension | What It Asks |
|---|
| Income distribution | How earnings, wages, salaries, profits, rents, interest, and transfers are spread across households |
| Wealth distribution | How accumulated assets — savings, homes, stocks, businesses — are spread across households and generations |
| Consumption distribution | How much households actually spend, which can differ from income because of savings, debt, and transfers |
| Opportunity distribution | Whether people in different circumstances have comparable chances to develop abilities and improve their position |
Positive and Normative Together
Distribution involves positive questions (What is the distribution? Why does it look this way?) and normative questions (How much inequality is acceptable? What should government do?). This chapter focuses mainly on the positive questions — measurement, patterns, and causes — while flagging where values necessarily enter.
- Explain, using Economy A and Economy B, why two economies with identical total income can still differ enormously.
- Name one question about distribution that economics can answer with evidence, and one that requires a value judgment.
- Give an example of a household that would look different depending on whether you examined its income, its wealth, or its consumption.
Section 19.2
Income and Wealth
Income is the flow of money or its equivalent that a household receives over a period of time, usually measured annually. Sources include labor income (wages, salaries, self-employment earnings), capital income (dividends, interest, rent, capital gains), business income, and transfer income (Social Security, unemployment insurance, means-tested assistance).
Market income is income earned before taxes and transfers. Disposable income is income after taxes are paid and transfers received. Countries with more extensive transfer programs tend to show less disposable income inequality than market income inequality.
Wealth (net worth) is the stock of accumulated assets minus liabilities at a point in time — home equity, savings, retirement accounts, stocks and bonds, and business ownership, minus mortgages, loans, and other debt. Wealth accumulates over time, generates its own income, provides security against shocks, and is partly inherited across generations — which gives wealth inequality a self-reinforcing character.
| Feature | Income (flow) | Wealth (stock) |
|---|
| What it measures | What a household earns over a period | What a household owns minus what it owes, at a point in time |
| Behavior over time | Resets each period | Accumulates or depletes over time |
| Distribution | Unequal, but typically less so than wealth | Typically more concentrated than income |
| Inheritance | Not directly inherited | Substantially transferred across generations |
Example 19.2.1
Income and wealth do not always move together
- Case 1A physician earns $250,000 per year but carries $300,000 in student loans and has no savings: high income, low or negative wealth.
- Case 2A retiree has $800,000 in savings but no current labor income: high wealth, low income.
- Case 3A middle-class household has paid off its home and saved for thirty years: moderate income, substantial wealth relative to younger households earning the same income.
Key takeaway: Income and wealth are different dimensions of economic position. A full picture requires both.
- Classify as income or wealth: a paycheck
- Classify as income or wealth: a paid-off home
- Classify as income or wealth: dividends received this year
- Classify as income or wealth: a retirement account balance
- Explain why market income inequality and disposable income inequality can differ.
- Explain why wealth is described as "self-reinforcing" across generations.
Section 19.3
Measuring Poverty
Poverty is a condition in which individuals or households lack sufficient resources to meet basic needs or achieve a minimally acceptable standard of living. Because "sufficient" and "basic needs" are value-laden concepts, every poverty measure embeds assumptions.
The most common approach uses a poverty line: an income level below which a household is considered poor. The official U.S. threshold, developed in the 1960s by Mollie Orshansky, multiplied the cost of a minimum food budget by a fixed factor and adjusts the result for family size and inflation each year.
Poverty Rate Formula
Poverty Rate = (Number of people below the poverty line ÷ Total population) × 100
If 36 million people out of a population of 330 million fall below the line, the poverty rate is approximately 10.9 percent.
Limitations of the Official Measure
It excludes non-cash benefits (SNAP, housing vouchers, Medicaid, EITC), uses pretax income, ignores geographic cost-of-living differences, and relies on an outdated food-spending multiplier from the 1960s. The Supplemental Poverty Measure (SPM) addresses several of these issues by counting non-cash benefits, subtracting taxes and certain expenses, and adjusting for geography — though no measure is perfect.
- A population of 250 million has 28 million people below the poverty line. Calculate the poverty rate.
- Explain why the official poverty measure might overstate poverty for a household that receives substantial SNAP and housing assistance.
- Explain why a fixed national poverty threshold treats a family in a low-cost area differently in real terms from a family in a high-cost city, even at the same income.
- Name one strength and one weakness of the Supplemental Poverty Measure compared with the official measure.
Section 19.4
Absolute and Relative Poverty
Absolute poverty measures deprivation against a fixed material standard — enough food, shelter, clean water, and basic clothing — regardless of what others have. It does not move with rising average income: a household earning $5 per day in purchasing-power terms is absolutely poor whether the average household earns $30 or $100 per day. By this standard, global extreme poverty has fallen substantially over recent decades.
Relative poverty measures poverty against the living standards of others in the same society, often set at 50 or 60 percent of median household income. It moves with average living standards — a household not relatively poor in 1970 might be relatively poor today as typical living standards rise.
Example 19.4.1
Calculating a relative poverty line
- SituationMedian household income in a country is $70,000 per year.
- 50% lineRelative poverty line = 0.50 × $70,000 = $35,000
- InterpretationHouseholds earning below $35,000 are counted as relatively poor — even if they can meet basic survival needs, they may be excluded from typical social participation.
Key takeaway: Relative poverty rises automatically as median income rises, even if no household's real income falls.
- Median household income is $60,000. Calculate the relative poverty line at 60 percent of the median.
- If a country doubles every household's income proportionally, what happens to its absolute poverty rate? What happens to its relative poverty rate?
- Explain how global extreme poverty (absolute) can fall while relative poverty in a wealthy country rises at the same time, without contradiction.
- Which measure would you use to compare poverty between a low-income and a high-income country? Which would you use to track poverty within one country over twenty years? Explain.
Sections 19.5 – 19.7
Measuring Inequality
Income Inequality · Lorenz Curves · The Gini Coefficient
Section 19.5
Income Inequality
Economists often divide the population into quintiles — five equal groups of 20 percent each, ranked by income — to describe how income is shared.
| Quintile | Share of Total Household Income |
|---|
| Lowest 20% | 3.5% |
| Second 20% | 9.0% |
| Middle 20% | 14.5% |
| Fourth 20% | 22.5% |
| Highest 20% | 50.5% |
If income were distributed perfectly equally, every quintile would receive exactly 20 percent. The table above shows substantial inequality: the top quintile receives more than half of all income while the bottom quintile receives only 3.5 percent. U.S. income inequality was stable or declining after World War II — the "Great Compression" — but has risen substantially since the late 1970s, with an especially large share of gains going to the top 1 percent.
The 90/10 ratio compares income at the 90th percentile to income at the 10th percentile. If the 90th-percentile household earns $120,000 and the 10th-percentile household earns $15,000, the ratio is 8 — the higher earner makes eight times as much.
- 90th percentile income $150,000; 10th percentile income $20,000. Find the 90/10 ratio.
- If the 90/10 ratio rises from 6 to 9 over a decade, what does this indicate?
- Using the quintile table above, how much more income share does the top quintile hold than the bottom quintile?
- Explain one reason the top 1 percent is often examined separately from the rest of the top quintile.
Section 19.6
Lorenz Curves at an Introductory Level
A Lorenz curve, developed by Max Lorenz in 1905, graphs the cumulative percentage of total income (vertical axis) received by the cumulative percentage of the population (horizontal axis), ranked from lowest to highest income.
The curve always begins at (0, 0) and ends at (100, 100). The line of perfect equality is the 45-degree diagonal connecting these points — if every household had identical income, the bottom 10 percent would hold 10 percent of income, the bottom 30 percent would hold 30 percent, and so on. An actual Lorenz curve always bows below this diagonal; the further it bows, the greater the inequality.
Example 19.6.1
Reading a Lorenz curve
- Data pointThe bottom 40 percent of households together receive 15 percent of total income.
- ComparisonUnder perfect equality, the bottom 40 percent would hold 40 percent.
- GapInequality gap at this point = 40% − 15% = 25 percentage points
Key takeaway: The vertical gap between the diagonal and the curve at any population point measures the degree of inequality at that point.
Comparing Curves
If one country's Lorenz curve lies entirely below another's, the first country has greater inequality. When curves cross, no clear ranking exists without additional information — and the Lorenz curve alone never tells you the average income level, only the shape of the distribution.
- An economy's quintile shares are: 4%, 10%, 16%, 24%, 46%. Calculate the cumulative income shares for the bottom 20%, 40%, 60%, 80%, and 100% of households.
- Using your answer above, find the gap between the line of perfect equality and the Lorenz curve at the 60 percent population mark. What does this gap represent?
- Country A's Lorenz curve lies entirely below Country B's curve. Which country has greater inequality? Could Country A still have a higher average income than Country B? Explain.
Section 19.7
Gini Coefficient at an Introductory Level
The Gini coefficient, developed by Corrado Gini in 1912, summarizes inequality as a single number derived directly from the Lorenz curve.
Gini Coefficient Formula
Gini = Area between the line of perfect equality and the Lorenz curve ÷ Total area under the line of perfect equality
Gini = 0 means perfect equality. Gini = 1 means one household holds all income and everyone else holds none.
High-income countries typically have income Ginis between roughly 0.25 and 0.45. Strong-redistribution countries such as Denmark, Sweden, and Finland often record disposable-income Ginis around 0.25–0.30. The United States and the United Kingdom typically fall around 0.35–0.40. Some developing countries with extreme inequality, such as South Africa and Brazil, have recorded Ginis of 0.55–0.65 or higher. Wealth Ginis are generally higher than income Ginis, since wealth is more concentrated.
What the Gini Hides
Two countries can share the same Gini coefficient while having very different distributions — one with a large middle class and a small top-bottom gap, another with severe polarization and little in the middle. The Gini also depends on whether market or disposable income is used, and it says nothing about non-market dimensions of well-being such as access to public services.
- Country X has a Gini of 0.28. Country Y has a Gini of 0.52. Which country has greater inequality? Describe what this might look like in terms of quintile shares.
- Explain why a country's Gini coefficient is typically lower when calculated on disposable income than on market income.
- Explain why two countries with the same Gini coefficient might still look very different to someone living in the middle of each distribution.
- Is a Gini of 0 a realistic outcome for any real economy? Why or why not?
Sections 19.8 – 19.10
Mobility, Causes, Consequences, and Policy
Economic Mobility · Causes and Consequences · Policy Options and Tradeoffs
Section 19.8
Economic Mobility
Economic mobility is the ability of individuals or families to change their economic position over time. Intragenerational mobility measures change within a single person's lifetime. Intergenerational mobility measures how children's economic position compares with their parents'.
The intergenerational earnings elasticity (IGE) measures the correlation between parents' and children's adult earnings. An IGE of 0 means no relationship; an IGE of 1 means children's earnings exactly replicate their parents'. Research by economist Miles Corak and others suggests the United States has relatively low intergenerational mobility compared with many other high-income countries, especially Scandinavian nations — a relationship captured in the Great Gatsby Curve, a term coined by economist Alan Krueger, linking higher inequality today to lower mobility tomorrow.
Research using large administrative datasets, including work by Raj Chetty and colleagues at Opportunity Insights, finds that a child's outcomes are strongly predicted by parental income and that intergenerational mobility varies dramatically by region — some communities look more like Denmark, others show very persistent poverty.
- A woman raised in a bottom-quintile household reaches the middle quintile as an adult. Classify this as intragenerational or intergenerational mobility, and state the direction.
- A man earning a middle-class income for most of his career retires on a lower fixed income. Classify and state the direction.
- Explain, in your own words, one mechanism by which high inequality might reduce intergenerational mobility.
- Does the correlation behind the Great Gatsby Curve prove that inequality causes low mobility? What else might explain the pattern?
Section 19.9
Causes and Consequences of Poverty and Inequality
Inequality arises from many interacting forces rather than one dominant cause.
| Cause | Mechanism |
|---|
| Labor market earnings | Wages reflect skills, education, and productivity; skill-biased technological change has widened gaps between high- and low-education workers |
| Capital income | Concentrated asset ownership generates dividends, interest, rent, and capital gains mostly for high-wealth households |
| Inheritance | Intergenerational gifts and bequests transmit advantages — and disadvantages — across generations |
| Discrimination and structural barriers | Unequal access to education, credit, employment, and wages based on race, gender, or other characteristics |
| Geography | Schools, job access, healthcare, and social networks vary sharply by community |
| Globalization and trade | Wages rise for globally scarce skills and face pressure where skills are globally abundant |
| Institutions and policy | Tax structure, labor regulation, unions, minimum wages, and education funding shape outcomes |
Consequences are similarly mixed. Some inequality preserves incentives to invest in skills and take entrepreneurial risk. But high inequality may reduce mobility, dampen aggregate demand (since high earners save more of each additional dollar — a contested claim), cause underinvestment in human capital, distort political influence, weaken social trust, and correlate with worse health outcomes.
Source Matters
Economists distinguish inequality reflecting choices, effort, and skill from inequality reflecting accidents of birth, discrimination, or structural barriers. The policy and ethical implications differ depending on which source dominates in a given case.
- Describe skill-biased technological change in your own words and explain how it widens inequality.
- Explain why wealth inequality tends to be more persistent across generations than income inequality.
- Give one argument that some inequality is economically useful, and one argument that high inequality imposes real economic costs.
- Explain why the "reduced aggregate demand" consequence of inequality is described in the text as contested.
Section 19.10
Policy Options and Tradeoffs
Governments use several categories of tools to address poverty and inequality, each with its own mechanism and tradeoffs.
| Tool | Mechanism | Key Tradeoff |
|---|
| Direct cash transfers | EITC, Social Security, means-tested cash assistance | Cost to taxpayers; possible work-incentive effects from benefit phase-outs |
| In-kind transfers | SNAP, housing assistance, Medicaid, Head Start | Less flexible than cash; may be less economically efficient but more targeted to needs |
| Minimum wage | Legal floor on hourly pay | Theory predicts employment effects; empirical evidence on moderate increases is mixed |
| Progressive taxation | Higher marginal rates on higher incomes fund redistribution | Possible effects on work, saving, investment, and business location decisions |
| Wealth and estate taxes | Taxes intergenerational transfers of wealth | Possible effects on saving, investment, and avoidance behavior |
| Education investment | Early childhood, K–12, and higher education access | Long-term payoff; effects on inequality emerge slowly |
| Labor market institutions | Unions, collective bargaining, worker protections | Affects bargaining power and wage distribution; possible effects on flexibility |
| Anti-discrimination enforcement | Enforces equal treatment in hiring, pay, housing, credit | Reduces discrimination-driven inequality; enforcement and compliance costs |
The Efficiency-Equity Tradeoff Revisited
Taxes funding transfers can create deadweight loss by altering work, saving, and investment incentives. But underinvestment in human capital among disadvantaged children is also an efficiency loss — a loss of productive capacity. Well-designed policies, such as the EITC's phase-in structure, can reduce poverty while preserving or strengthening work incentives. The size of any efficiency cost depends heavily on policy design, not merely on whether redistribution occurs.
What Economics Can and Cannot Resolve
Economics can identify which policies reduce poverty and inequality, what tradeoffs they involve, and what the evidence shows about their effects. It cannot determine, on its own, how much inequality a society should accept or how aggressively to act — those are normative questions about values such as freedom, fairness, solidarity, and community.
- For the Earned Income Tax Credit, identify the target population, the mechanism, and one likely benefit and one possible tradeoff.
- An argument claims: "Any redistribution from rich to poor must reduce total efficiency, so redistribution is always harmful." Identify the positive claim, the hidden normative assumption, and one reason the conclusion does not necessarily follow.
- Explain how a minimum wage increase could be evaluated using the mechanism-target-benefit-tradeoff framework used throughout this section.
- Explain why economists describe the efficiency-equity tradeoff as "not as stark as it might first appear."
Chapter 19 — Back Matter
Chapter Summary
- Sec 19.1Distribution matters because access to resources and opportunity depends on how income and output are shared, not just how much is produced. Income, wealth, consumption, and opportunity are distinct dimensions of distribution.
- Sec 19.2Income is a flow received over time; wealth is a stock of assets minus liabilities at a point in time. Wealth is more unequal than income, generates its own income, and is partly inherited, giving it a self-reinforcing character.
- Sec 19.3Poverty is measured against a poverty line. The official U.S. measure has well-known limitations; the Supplemental Poverty Measure addresses several but not all of them.
- Sec 19.4Absolute poverty uses a fixed material standard; relative poverty is measured against the surrounding society's living standard. Both are useful for different questions.
- Sec 19.5Quintile shares and ratios like the 90/10 ratio describe how income is distributed. U.S. inequality rose substantially after the late 1970s following the postwar "Great Compression."
- Sec 19.6The Lorenz curve graphs cumulative income share against cumulative population share. It always lies on or below the line of perfect equality; greater bowing means greater inequality.
- Sec 19.7The Gini coefficient summarizes the Lorenz curve as a single number from 0 (perfect equality) to 1 (perfect inequality), but hides variation in the shape of the distribution.
- Sec 19.8Economic mobility describes how position changes within a lifetime (intragenerational) or across generations (intergenerational). The Great Gatsby Curve links high inequality with low intergenerational mobility.
- Sec 19.9Inequality arises from many interacting causes — labor markets, capital income, inheritance, discrimination, geography, trade, and institutions — with consequences that depend on the source and magnitude.
- Sec 19.10Policy tools include transfers, in-kind benefits, minimum wages, progressive and wealth taxation, education investment, labor institutions, and anti-discrimination enforcement, each with tradeoffs that economics can analyze but not fully resolve.
Key Terms Review
income
The flow of money or its equivalent received by a household over a period of time, including labor, capital, business, and transfer income.
wealth (net worth)
The stock of accumulated assets minus liabilities at a given point in time.
market income
Income earned before government taxes and transfers.
disposable income
Income after taxes are paid and transfers are received.
poverty line
A specific income level below which a household is classified as poor.
poverty rate
The percentage of the population with income below the poverty line.
Supplemental Poverty Measure
An alternative U.S. poverty measure accounting for non-cash benefits, taxes, geographic cost differences, and certain expenses.
absolute poverty
Poverty defined against a fixed minimum standard of material need that does not change with overall living standards.
relative poverty
Poverty defined relative to the typical or median living standard of the surrounding society.
quintile
One of five equal groups into which a population is divided by income rank.
Lorenz curve
A graph of cumulative income share against cumulative population share, ranked from lowest to highest income.
line of perfect equality
The 45-degree diagonal on a Lorenz curve diagram, representing equal income for every household.
Gini coefficient
A summary measure of inequality, from 0 (perfect equality) to 1 (perfect inequality), based on the area between the Lorenz curve and the line of equality.
intragenerational mobility
Change in an individual's own economic position over their lifetime.
intergenerational mobility
The degree to which a child's adult economic position differs from that of their parents.
intergenerational earnings elasticity
A statistical measure of the correlation between parents' earnings and children's adult earnings.
Great Gatsby Curve
The observed relationship between high inequality in a society and low intergenerational mobility.
skill-biased technological change
Technological change that raises demand and wages for highly skilled workers while reducing them for routine-task workers.
progressive tax
A tax whose marginal rate rises with income, so higher earners pay a larger share.
Earned Income Tax Credit
A refundable tax credit for working households with low and moderate incomes that phases in, then phases out, as earnings rise.
deadweight loss
Loss of total economic surplus when a policy or distortion pushes output or transactions below the efficient level.
Distribution Graph Practice
Problem 19.A
Building and reading a Lorenz curve
- DataQuintile shares: 4%, 10%, 16%, 24%, 46%.
- Task (a)State the share each quintile would receive under perfect equality.
- Task (b)Calculate cumulative income shares at the bottom 20%, 40%, 60%, 80%, and 100% of households.
- Task (c)Plot the points and draw the Lorenz curve and the line of perfect equality on the same axes.
- Task (d)At the 60 percent population mark, find the gap between the line of equality and the curve, and explain what it represents.
- The official poverty threshold for a family of three is $24,000. The SPM threshold for a similar family in a high-cost urban area is $31,000. A family earns $22,000 in wages plus $4,500 in SNAP and $2,000 in housing vouchers. (a) Are they poor by the official measure? (b) By the SPM? (c) Why does the official measure count only cash income? (d) Why might the SPM threshold differ by geography?
- Country A's Lorenz curve lies entirely below Country B's. (a) Which country has greater inequality? (b) Which has the higher Gini? (c) Could Country A still have higher average income than Country B?
- An economist claims, "Any policy that redistributes income from rich to poor must create efficiency losses, so redistribution is always harmful." (a) Identify the positive claim. (b) Identify the hidden normative assumption. (c) Give one reason redistribution might improve, rather than reduce, efficiency. (d) Even granting some efficiency cost, does that make redistribution unjustified? Explain.
- Evaluate the following policy using mechanism, target population, likely benefit, and tradeoff: a refundable child tax credit of $3,000 per child per year for families below the median income.
Common Misconceptions
Misconception 1 — "Poverty is simply about not working hard enough."
Poverty has multiple causes: low wages, health problems, caregiving responsibilities, discrimination, geographic barriers, and limited access to education and training. Many people in poverty are employed but earn wages insufficient to cover basic costs, especially in high-cost areas.
Misconception 2 — "A rising Gini coefficient always means the poor are getting poorer."
A rising Gini means the distribution is becoming more unequal, not that absolute incomes are falling. All quintiles can rise in absolute terms while the Gini still rises, if top incomes rise faster than bottom incomes.
Misconception 3 — "Equality of outcome is the only alternative to unequal outcomes."
Equality of opportunity (comparable access to education, healthcare, and resources regardless of background) is distinct from equality of outcome (identical income or wealth for all). Many policies target opportunity rather than outcomes.
Misconception 4 — "Income and wealth are the same thing."
Income is a flow; wealth is a stock. Two households can earn similar incomes but hold very different wealth depending on decades of saving and asset accumulation.
Misconception 5 — "The Gini coefficient is the only measure of inequality that matters."
The Gini is a useful summary but cannot distinguish between different distributions sharing the same value, and it is more sensitive to changes in the middle of the distribution than at the extremes. Comprehensive analysis uses quintile shares, top-1-percent shares, ratios, and Lorenz curves together.
Review Questions
- Explain why economists distinguish between income and wealth when studying economic distribution.
- What is the poverty line, and what does it mean to be counted as poor by the official measure?
- Describe two limitations of the official U.S. poverty measure and how the Supplemental Poverty Measure addresses them.
- Distinguish absolute poverty from relative poverty, with an example where one falls while the other rises.
- What does the Lorenz curve show, and how is it constructed from quintile income share data?
- Why does the Lorenz curve of an unequal economy always lie below the line of perfect equality?
- What does the Gini coefficient measure, and what does a value of 0.50 mean compared with 0.25?
- Define intergenerational mobility and explain what the Great Gatsby Curve suggests about its relationship to inequality.
- Describe three mechanisms that contribute to income inequality.
- Explain one efficiency-related cost of high inequality and one efficiency-related justification for reducing it.
- Describe three policy tools used to address poverty, with one tradeoff for each.
- Explain why economics can inform but not fully resolve debates about how much inequality a society should accept.
Chapter 19 Checkpoint
Chapter 19 Checkpoint
Poverty, Inequality, and Economic Mobility — Complete without assistance; assesses all key skills and concepts from Chapter 19
Section 1 — Vocabulary and Concepts
- Define income and wealth, and explain why a household could be high in one but low in the other.
- Distinguish absolute poverty from relative poverty.
- Explain what the Lorenz curve and the line of perfect equality each represent.
- Define intergenerational mobility and explain the Great Gatsby Curve.
Section 2 — Measurement and Calculation
- A population of 200 million has 21 million people below the poverty line. Calculate the poverty rate.
- Median household income is $65,000. Calculate the relative poverty line at 50 percent of the median.
- An economy has quintile income shares of 5%, 11%, 17%, 23%, 44%. Calculate the cumulative income share held by the bottom 60 percent of households.
Section 3 — Graph and Data Interpretation
- Country M has a Gini of 0.31; Country N has a Gini of 0.49. Which country's Lorenz curve bows further from the line of perfect equality? Explain.
- Explain what it would mean if two countries had identical Gini coefficients but very different quintile income share tables.
Section 4 — Applied Analysis
- Identify three distinct causes of income inequality discussed in this chapter and explain the mechanism behind each in one or two sentences.
- Choose one policy tool from Section 19.10. Identify its mechanism, its target population, one likely benefit, and one tradeoff.
Section 5 — Positive, Normative, and Policy Reasoning
- An argument states that redistribution is "always harmful" because it creates efficiency losses. Identify the positive claim, the hidden normative assumption, and explain why the conclusion does not necessarily follow from the premise.
Looking Ahead
Chapter 20: Measuring the Economy: GDP and National Income
Chapter 19 examined how income and wealth are distributed within an economy, how poverty and inequality are measured, and what causes and consequences flow from these patterns. Chapter 20 shifts the focus from distributional questions to measuring the economy as a whole. We turn to macroeconomics and ask how economists measure total national output, what gross domestic product includes and leaves out, how to distinguish final goods from intermediate goods, and how to compare output across time when prices are changing. The national income accounting tools introduced in Chapter 20 will be essential for everything that follows in macroeconomics: unemployment, inflation, business cycles, monetary policy, fiscal policy, growth, and international trade.
MGU Library Connection
- Poverty and Inequality Measurement Guide — MGU Library Companion Resources
- Economics Graphing Checklist — Appendix C: Microeconomics Graph Reference
- Appendix E: Formula and Calculation Reference — poverty rate, Gini coefficient, percentage change
- Appendix G: Policy Analysis Reference — mechanism, tradeoffs, efficiency and equity
- Chapter 18: Government, Taxes, Regulation, and Redistribution — connects directly to Section 19.10
- Chapter 15: Labor Markets, Wages, and Income — connects directly to Section 19.9
- Appendix L: Glossary — income, wealth, poverty, inequality, mobility