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Week 15 · Chapter

Chapter 15 — Political Economy & Global Issues

Introduction to Political Science Free sample edition

The module's primary reading · ~50–60 minutes · Objective 8 (explain the major theories of international relations — realism, liberalism, and constructivism — and the basics of the international system, international organizations and law, and global political economy, presenting competing theories and contested global questions evenhandedly and reading global data for what a measure and a line mean), Objective 3 (compare the major political ideologies and normative theories evenhandedly — liberalism, conservatism, socialism and its family, and the smaller families; justice, liberty, equality, and rights; the harm principle; Rawls and Nozick — stating each position in its strongest form and distinguishing empirical from normative claims) · Read it first this week; the lecture, the slides, the tutorial, the quiz, and the workshop all build on it.

In plain language

This week is about where politics and money meet: who gains and who pays from trade, how many people live in deep poverty, and how countries handle problems none can solve alone. The field that studies this is political economy (how politics and economics shape each other). You will read a real count of the world's poor and learn that a poverty line (the income level a measurer picks as the cutoff for being poor) is a definition that can change. You will also see why fighting climate change is hard even when everyone agrees on the basic facts. As in every week, you will keep what the evidence shows apart from what anyone ought to do about it, and the verdict on the big questions stays with you.

Why you already care about this

Picture two made-up towns on the same river. Every detail here is illustrative. In the first town, a new port opens and ships out the grain the valley grows, and 3 new warehouses go up along the dock. In the second town, 10 miles downstream, a weaving mill closes because cloth now arrives cheaper by ship, and the families who worked its looms start looking for new jobs.

It is the same trade, seen from two towns. The people in the first town would tell you that trade has been good to them. The people in the second town would tell you it took something away. Both of them are describing something real. A political scientist's job is not to pick a town. It is to say what each town's story shows, what it does not, and where the argument stops being about facts and starts being about values.

That is the whole shape of this final chapter. You will meet the ideas economists and political scientists use to describe trade and poverty. You will read the World Bank's count of the world's poorest people for what it measures and what it does not. And you will practice keeping the facts apart from the verdict one last time.

By the end of this chapter you will be able to:

explain why every real economy is a mixed economy and sort two economies with the varieties-of-capitalism model without ranking them;
show with numbers how two countries gain from specialization, even when one is faster at everything;
state the free-trade case and the managed-trade case at full strength, each built on the same two findings;
tell poverty from inequality, and between-country from within-country inequality;
read the World Bank's International Poverty Line and its count with their price base and year, and say what the figures do not show;
explain why climate change is a collective-action problem and give a proponent's and a critic's case for each policy response.

Carry this line with you: the same trade, two towns — describe both before you judge either.

Where we are

Already covered: Week 1 gave you the empirical/normative distinction and the toolkit. Week 3 sorted the ideologies, including socialism and liberalism. Week 4 gave you equality of opportunity and equality of outcome. Week 12 kept correlation apart from cause, Week 13 read real indices with their edition and year, and Week 14 explained why states under anarchy struggle to cooperate.
This week: political economy and the mixed economy, the varieties of capitalism, comparative advantage and trade policy, poverty against inequality, the World Bank's poverty line and count, climate change as a collective-action problem, migration, and the globalization debate.
How they connect: this week uses every habit at once. Week 12's "correlation or cause?" meets the poverty data, Week 14's anarchy meets climate, and Week 1's empirical/normative line runs through all of it.
Where we're going next: this is the final module. The finals week follows, with the Final Practice Exam and the final, and no new material to learn.

Three earlier ideas carry this chapter. From Week 1, an empirical claim says what is and can be checked against evidence, and a normative claim says what ought to be and is argued from values. From Week 12, a correlation is an association between two things that by itself does not show one causes the other. From Week 14, anarchy means no authority above sovereign states can make and enforce rules for them. Keep all three within reach.

1. Find the seam: political economy and the mixed economy

Think about the price of a bus ticket in your town. A transit agency, which is part of government, sets the fare. Drivers bargain over their pay. Fuel is bought on a market whose price swings with the world. One ticket carries decisions made by voters, officials, unions, and markets all at once.

That knot is what this week studies. Political economy is the study of how politics and economics shape each other: how states set the rules that markets run on, and how markets shape who holds power.

Political economy is not a sixth subfield. It is work at the seam where three of the five subfields meet. Comparative politics asks how one country's economy is governed compared with another's. International relations asks how trade and money move between states. Political theory asks what a fair economy would look like. You have been using all three lenses for weeks; this week points them at the same object.

The first fact of the field is this:

A mixed economy is an economy in which markets and the state both decide what is made and who gets it; every real economy is mixed, and economies differ in the mix and the institutions that carry it.

No real country lets markets decide everything, with no courts to enforce contracts and no rules for money. No real country lets the state decide everything either. So the comparative question is never "markets or the state?" It is "what mix, and through which institutions?"

Misconception check. Students often think a country is either capitalist or socialist, as if every economy fit in one of two boxes. That is tempting, because the two words sound like opposite teams. But in Week 3 you met socialism as a family of ideologies, a set of ideas about how an economy should work. A real economy is a mix, and the useful question is how much of each and through what rules.

Memory hook: no economy is pure; the question is the mix.

2. Describe without ranking: the varieties of capitalism

Picture two made-up bakeries in two made-up countries. In the first, the owner sets wages alone, bakers move to a rival shop whenever it pays more, and the owner borrows from whichever lender offers the best rate this year. In the second, a bakers' association and the bakers' union agree on wages for the whole trade. That bakery has used the same bank for 20 years, and new bakers learn the craft in a training program the shop and the union run together. Both bakeries sell bread in a market. They coordinate in very different ways.

Hall and Soskice (2001), Varieties of Capitalism, taught here in words, turned that difference into a model of whole economies.

Varieties of capitalism is a classroom model that sorts market economies by how firms coordinate with one another, describing liberal market economies and coordinated market economies without ranking them.
A liberal market economy is a market economy in which firms coordinate mainly through competitive markets, using prices, contracts, and short-term hiring.
A coordinated market economy is a market economy in which firms coordinate through employer associations, unions, and long-term relationships with banks and other firms rather than mainly through markets.

Worked example — the economy sort. Duskmere and Moravell are made-up economies, and everything about them is illustrative. In Duskmere, firms set wages one firm at a time, workers change jobs often, and firms raise money mainly by selling shares, so firms coordinate through markets: a liberal market economy. In Moravell, employer associations and unions bargain over wages for a whole industry, firms keep long-term ties with their banks, and firms and unions run apprenticeships together, so firms coordinate outside markets: a coordinated market economy. Tally: 1 + 1 = 2 economies sorted, and neither is ranked.

Two cautions come with the model. First, it is a classroom model, a simplification you can hold in one hand, and many real economies sit somewhere between the two types. Second, the word "liberal" here describes how markets coordinate. It is not the "liberal" of U.S. party talk, and it is not the liberal international relations theory from Week 14.

Misconception check. Students often read the two types as a ranking, assuming one kind of economy is the better one. That is tempting, because a list of two looks like a contest. But Hall and Soskice describe how coordination happens. Which mix a country ought to choose is a normative question, and the model does not answer it.

Memory hook: markets or networks — two ways to coordinate, not a winner and a loser.

3. Work the logic: comparative advantage

Two roommates have a messy kitchen and a pile of laundry. One roommate is faster at both chores. You might think the faster one should do everything. But if each takes the chore where they give up less, the work gets done sooner for both. The faster roommate is far faster at laundry and only a little faster at dishes, so the slower roommate takes the dishes, and both are free sooner.

That "give up less" has a name.

Opportunity cost is what you give up to make or do one thing instead of another, such as the cloth a country could have made with the hours it spends on grain.
Comparative advantage is the descriptive claim that countries gain in total when each specializes in what it gives up less to make, even if one country is faster at making everything.
Specialization means concentrating work on the goods a person or country makes at a lower opportunity cost and trading for the rest.

The idea comes from Ricardo (1817), taught here in words.

Worked example — opportunity cost. Bellmoor and Talvik are made-up countries, and every number here is illustrative. Bellmoor makes 1 bolt of cloth in 2 hours and 1 crate of grain in 4 hours. Talvik makes 1 bolt of cloth in 6 hours and 1 crate of grain in 6 hours, so Bellmoor is faster at both. Now count what each gives up. In Bellmoor, 1 crate of grain costs 4 ÷ 2 = 2 bolts of cloth, and 1 bolt of cloth costs 2 ÷ 4 = 0.5 crates of grain. In Talvik, 1 crate of grain costs 6 ÷ 6 = 1 bolt of cloth. So Bellmoor gives up less to make cloth (0.5 crates against 1), and Talvik gives up less to make grain (1 bolt against 2).

Worked example — the gains from specialization. Each country has 48 hours of work. Without trade, each splits its hours evenly, 24 and 24. Bellmoor makes 24 ÷ 2 = 12 bolts and 24 ÷ 4 = 6 crates. Talvik makes 24 ÷ 6 = 4 bolts and 24 ÷ 6 = 4 crates. Together they make 12 + 4 = 16 bolts and 6 + 4 = 10 crates.

Now let each lean toward what it gives up less to make. Talvik makes only grain: 48 ÷ 6 = 8 crates. Bellmoor spends 8 hours on grain, 8 ÷ 4 = 2 crates, and the other 48 − 8 = 40 hours on cloth, 40 ÷ 2 = 20 bolts. Together they make 20 bolts and 8 + 2 = 10 crates. That is the same grain and 20 − 16 = 4 more bolts of cloth, from the same hours of work. In words: specializing by opportunity cost, not by speed, gave the pair 4 extra bolts.

Notice what the example does not settle. How the 4 extra bolts are split depends on the terms of trade, which this example does not fix. And Talvik's weavers lose their trade either way. Hold on to that; it is the next section.

You should also know the kind of claim you have made. Comparative advantage is an empirical and logical claim about gains in total. It is not a policy, and it does not say what a government ought to do.

Misconception check. Students often think a country that is faster at making everything has nothing to gain from trade. That is tempting, because "faster" sounds like "better at everything, so do everything." But gains come from opportunity cost, not speed. Bellmoor is faster at both goods and still ends up with 4 more bolts by letting Talvik make the grain.

Memory hook: trade on what you give up, not on how fast you go.

4. Weigh the findings: trade policy

Go back to the two river towns. The port town gained, and the mill town lost. Both facts can be true at the same time, and the argument about trade starts there.

Trade policy is the rules a government sets for goods crossing its border, such as tariffs, quotas, and trade agreements.
Aggregate gains are the total gain that trade brings to an economy taken as a whole, before asking who receives it.
Distributional costs are the losses from trade that fall on particular workers, firms, and towns, which can be concentrated and slow to heal even when the economy gains in total.

Both of those are documented findings. Trade brings aggregate gains. Trade also brings distributional costs that can be concentrated in particular places and slow to heal. Trade policy is where the two findings get weighed, and that weighing is normative.

Here are the two sides at full strength.

Proponents of free trade favor fewer barriers to goods crossing borders. They argue that the aggregate gains are large and widely shared, and that the people who lose can be helped through other policies, such as retraining or support for affected towns, without giving up the gains for everyone else.
Proponents of managed trade favor deliberate limits or conditions on trade. They argue that the costs land hard on particular communities and that "help them through other policies" often arrives late or not at all. A government, they hold, owes protection first to the people it governs whose livelihoods are on the line.

Each side weighs the same two findings differently. Neither side denies the other's finding. Free-trade proponents grant that the mill town lost, and managed-trade proponents grant that the economy gained in total. The disagreement is about how much a concentrated loss should count against a spread-out gain, which is a question about values.

Misconception check. Students often think that if trade has losers, comparative advantage must be wrong. That is tempting, because a theory of gains seems refuted by a closed mill. But comparative advantage is a claim about gains in total, and the mill is a distributional cost. Gains in total and losses in particular are two findings, not a contradiction.

Memory hook: gains for the whole, costs for the parts; policy weighs them.

5. Pull apart two words: poverty versus inequality

Picture a made-up apartment building. In one year, the lowest-paid tenant gets a raise and moves above the line where rent is unaffordable. In the same year, the tenant in the penthouse doubles their income. Did things get better or worse? It depends which question you are asking.

Poverty is having too little income or consumption to meet a stated threshold, measured as the share of people below a poverty line.
A poverty line is the income or consumption level a measurer chooses as the threshold of poverty; it is a definition, so it can be set differently and can change over time.
Inequality is the spread of a whole distribution of income or wealth, meaning how far apart the people at the top and the bottom sit.

Poverty is about a threshold. Inequality is about a spread. They can move in opposite directions.

Worked example — poverty versus inequality. Saltmere is a made-up town with 8 households, and every number here is illustrative. In the first snapshot, 2 of 8 sit below the town's line, which is 2 ÷ 8 × 100 = 25 percent, and the top household earns 5 times what the bottom household earns. In the second snapshot, 1 of 8 sits below the line, which is 1 ÷ 8 × 100 = 12.5 percent, and the top household earns 8 times what the bottom household earns. Poverty fell by 25 − 12.5 = 12.5 percentage points while the top-to-bottom gap grew from 5 times to 8 times. In words: Saltmere became less poor and more unequal at the same time.

Inequality also comes in two kinds, depending on whom you compare.

Between-country inequality is the gap between different countries' average incomes, treating each country as one unit.
Within-country inequality is the gap in income or wealth among the people who live inside one country.

The two are separate components, and they can move in opposite directions. Poorer countries can catch up with richer ones on average while the gap inside many countries widens, or the reverse.

Whether a level of inequality is fair is a normative question. It is the question you argued over in Week 4 with equality of opportunity and equality of outcome. Defenders of an opportunity standard hold that a wide spread is acceptable if everyone had a fair start. Defenders of an outcome standard hold that a wide spread is itself a problem, whatever the start. The numbers can tell you how wide the spread is. They cannot tell you how wide it ought to be.

Misconception check. Students often treat poverty and inequality as one thing, so that "poverty fell" seems to mean "inequality fell". That is tempting, because both are about people with less. But one is a threshold and the other is a spread. Saltmere's share below the line halved while its top-to-bottom gap grew.

Memory hook: poverty counts who is under the line; inequality measures the stretch.

6. Define the line: the International Poverty Line

Think about a speed limit sign. If the town raises the limit from 25 to 30, some drivers who were speeding the day before are legal the next morning. Nobody drove any differently; the line moved. A poverty line works the same way, and the world's main one moved recently.

The International Poverty Line is the World Bank's line for extreme poverty, 3.00 dollars a day in 2021 international prices, which in June 2025 replaced the earlier line of 2.15 dollars a day in 2017 prices.
Extreme poverty is living below the World Bank's International Poverty Line, the lowest threshold it uses to count the world's poor.
International prices are prices adjusted so that a dollar buys the same basket of goods in every country, the base in which a global poverty line is set.

The 2.15-dollar line had itself replaced an older line of 1.90 dollars a day in 2011 prices. Each line is written with its price base, because a dollar in 2011 prices, a dollar in 2017 prices, and a dollar in 2021 prices are three different rulers.

Worked example — the line and its price base. The International Poverty Line is 3.00 dollars a day in 2021 international prices, set in June 2025. It replaced 2.15 dollars a day in 2017 prices, which had replaced 1.90 dollars a day in 2011 prices. The price bases sit 2021 − 2017 = 4 years and 2017 − 2011 = 6 years apart, so the three lines are measured in different prices and are never compared as if they were one ruler.

Why did the line rise? The World Bank re-measured prices and the poorest countries' own national lines. The world did not grow poorer. Raising the line raised the count of people in extreme poverty by about 125 million (125,000,000), because the threshold moved and the count moved with it, as the speeding drivers did.

Misconception check. Students often cite 2.15 dollars a day, or 1.90 dollars a day, as the current line, and chatbots often do too. That is tempting, because older articles still use those numbers. But the current line is 3.00 dollars a day in 2021 international prices, set in June 2025. A figure computed on an older line is a figure under an earlier definition, and you say so in words whenever you meet one.

Memory hook: a line is a definition; always name the line and its price base.

7. Read the count: what the poverty data show and do not show

Imagine a gym that reports, "Members who run a mile under 10 minutes: up from 20 to 60." You would want to know how many members there are, what counts as a mile, and over what period. You would also want to know why before you credit the new coach. The world's poverty figures deserve the same questions.

The World Bank's poverty overview counts around 831 million people (831,000,000) living in extreme poverty in 2025, down from around 2.3 billion (2,300,000,000) in 1990. Our World in Data, built from the World Bank's Poverty and Inequality Platform, puts the share of the world's population below the line at about 44 percent in 1990 and about 10 percent in 2025. The same page reports about 24 percent below 5 dollars a day, 52 percent below 10, and 81 percent below 30.

Worked example — the count. Around 2.3 billion people (2,300,000,000) lived in extreme poverty in 1990 and around 831 million (831,000,000) in 2025, over 2025 − 1990 = 35 years. In millions, 2,300 − 831 = 1,469 million fewer people, a rough figure because both counts are rounded. The 2025 count is 831 ÷ 2,300 × 100 ≈ 36.1 percent of the 1990 count, a little over a third.

Worked example — the share. About 44 percent of the world's population lived below the line in 1990 and about 10 percent in 2025, a fall of 44 − 10 = 34 percentage points. The 1990 share versus the 2025 share is 44 ÷ 10 = 4.4 times as large. A share names its base, the world's population, and its year.

Worked example — four lines on one page. About 10 percent of the world lives below 3 dollars a day, 24 percent below 5, 52 percent below 10, and 81 percent below 30. Moving from the 3-dollar line to the 5-dollar line adds 24 − 10 = 14 percentage points; from 5 to 10 adds 52 − 24 = 28; from 10 to 30 adds 81 − 52 = 29. That leaves 100 − 81 = 19 percent at or above 30 dollars a day. The same world reads 10 percent poor or 81 percent poor depending on the line, a gap of 81 − 10 = 71 percentage points. That is why you always name the line.

Now run the data scaffold you have used since Week 11.

What is measured: income or consumption per person per day against a chosen line.
Over whom and when: the world's population, in 1990 and 2025.
What it shows: a long-run decline in extreme poverty, in the count and in the share.
What it does not show: why the decline happened, or whether any one policy caused it.
Correlation or cause: some readers credit trade, or one favorite policy, with the fall. The count shows that poverty fell, not why, so that credit is a claim about cause the numbers alone do not settle, and why poverty fell where it did is still debated.

In practice (your tools). In the workshop you rebuild these numbers in a spreadsheet. Type the 1990 and 2025 shares in two cells, then a formula such as =B2-C2 for the gap in percentage points and =B2/C2 for how many times as large one share is. For the count, =831/2300*100 returns the 2025 count as a percent of the 1990 count; set the cell to one decimal place to read 36.1.

One honesty note: the counts are rounded by their source, "around" 831 million and "around" 2.3 billion, so the differences you compute from them are rough too. Keep the word "around" whenever you quote them.

Misconception check. Students often read a falling poverty rate as proof that one policy caused it. That is tempting, because a big change seems to demand a single hero. But the chart shows that poverty fell, not why. The decline is the finding; why it happened where it did is a contested explanatory question the numbers alone do not answer.

Memory hook: the chart says how much; it never says why.

8. Name the trap: climate change as a collective-action problem

Picture a shared apartment fridge. Everyone wants it clean. Cleaning it takes an hour, and the person who cleans gets only a fifth of the benefit, because five people share the fridge. So everyone waits for someone else, and the fridge gets worse. Nobody in the apartment is wicked; the setup produces the mess.

A collective-action problem is a situation in which every member of a group would gain if all cooperated, yet each member does better by letting the others pay the cost.
A free rider is a member of a group who enjoys a shared benefit without paying any of its cost.

Climate change has that shape. The physical basics are stated plainly, as the scientific assessment record states them: rising greenhouse-gas concentrations trap heat, and the Intergovernmental Panel on Climate Change's assessments attribute the warming since the mid-twentieth century mainly to human activity. Those are empirical findings, and this course does not both-side them.

Worked example — the free-rider logic. Five made-up neighboring countries share one sky, and every number here is illustrative. A country that cuts its emissions pays a cost of 6 units, and its cut gives 2 units of benefit to each of the 5 countries. Acting alone, a country gets back 2 of the benefit and pays 6, so 2 − 6 = −4. Yet one cut is worth 2 × 5 = 10 units to the group, more than its cost of 6. If all 5 cut, each country receives 2 × 5 = 10 and pays 6, for 10 − 6 = 4. If 4 cut and 1 free rides, the free rider receives 2 × 4 = 8 and pays nothing, for 8, while each cutter gets 8 − 6 = 2. If none cut, each gets 0. Every country does better free riding (8 against 4), and if all reason that way, all end at 0 instead of 4.

Now connect it to Week 14. Under anarchy there is no world authority to make the five countries cut. Any deal has to rest on reciprocity, institutions, or shared norms, the same three explanations you met for why states keep their word.

The policy responses each have proponents and critics.

Carbon pricing is a policy that puts a charge on each unit of greenhouse gas emitted, so that emitters pay for the harm and choose where to cut. Proponents argue it lets each emitter find its own cheapest cut. Critics respond that the charge can fall hardest on lower-income households and is hard to set at the right level.
Regulation sets rules for what emitters may do. Proponents argue it gives certainty and acts directly on the biggest sources. Critics respond that fixed rules can be rigid and can cost more for each unit cut.
Subsidies pay for cleaner technology. Proponents argue they speed up new options and are easier to pass. Critics respond that they cost taxpayers and ask governments to pick winners.
Adaptation means changes that reduce the harm of a warming already under way, such as stronger flood defenses, rather than cutting the emissions that cause it. Proponents argue it protects people now, whatever other countries do. Critics respond that it treats the symptom and can weaken the push to cut.
International coordination means agreements among states. Proponents argue it is the only route that matches a shared sky. Critics respond that free riding and the lack of enforcement under anarchy make such deals fragile.

Misconception check. Students often think that because the science is settled, the policy is too. That is tempting, because a firm finding feels like it should come with a firm answer. But the physical basics are empirical, and which response is best is a normative and practical question about costs, fairness, and trust that the basics do not settle.

Memory hook: settled physics, open politics.

9. Keep the layers apart: migration

Think about a family that moves from one country to another for a job, for safety, or to join relatives. Their move raises two kinds of question at once. One kind asks who moves, why, and with what effects. The other asks what a country ought to do about it.

Migration is the movement of people across borders to live, studied as empirical questions about who moves, why, and with what effects, kept apart from the normative question of what policy a country ought to adopt.

Who moves, why, and with what effects are empirical questions. They are answered with data that carries its source and its year. This course pins no migration figure, so when you meet a claim about migration, your first move is to name the evidence you would need: which count, from which source, for which year.

How many people a country ought to admit, and on what terms, is a normative question. Here are the two sides at full strength.

Proponents of more open policies argue that movement brings gains to migrants and to the economies they join, and that people have a strong claim to seek a better life where they can find it.
Proponents of more restrictive policies argue that a political community has the right to decide its own membership, and that the costs of rapid change fall on particular communities, as trade's costs do.

Each side has a real point. Notice that the second argument echoes Week 2's state, which claims sovereignty over its territory and population, and the first echoes Week 4's language of rights.

Misconception check. Students often think a migration pattern settles the policy question, so that a number about who moves seems to prove what a country should do. That is tempting, because numbers feel decisive. But a pattern is empirical, and admission policy is normative. You can agree on every count and still disagree about the policy.

Memory hook: count the moves; argue the policy.

10. Close the arc: has globalization been a net good?

Go back one last time to the two river towns. The port town's warehouse workers and the mill town's weavers are living through the same thing from opposite ends. Now widen the lens to the whole world.

Globalization is the growing flow of goods, money, people, and ideas across national borders.

This week's open question is whether globalization has been a net good. Here is each side at full strength, for you to weigh.

Proponents point to the aggregate gains from trade and credit trade with part of the long-run fall in extreme poverty, from around 2.3 billion people in 1990 to around 831 million in 2025.
Critics point to concentrated distributional costs, to inequality within countries, and to shared problems such as climate that no market solves on its own.

Each side names a real weakness in the other. Proponents must face the correlation trap: crediting trade with the poverty decline rests on a correlation, not proof of a cause. Critics must face the aggregate gains, which are a documented finding, not a slogan.

This is the empirical/normative sandwich one last time. The bottom slice is empirical: what happened to poverty, to trade, to particular towns. The filling is your values: how much a concentrated loss counts against a spread-out gain. The top slice is your verdict, and it is normative. Keep the kinds of claim apart as you weigh. "Around 831 million people lived below the line in 2025" is empirical, checkable against the World Bank's overview. "The line is 3.00 dollars a day in 2021 international prices" is empirical too, a fact about how the World Bank defines its measure. "The line ought to be set higher" is normative, a claim about what counts as too little. Proponents of a higher line argue that 3.00 dollars a day misses people who still cannot meet basic needs. Defenders of the current line respond that it is anchored to the poorest countries' own national lines and keeps the focus on the worst off. No count settles it.

Pause and think, choosing one of these two:

(a) Pick the side of the globalization question you find less convincing and state its strongest case, as its best defender would state it.
(b) Pick one claim from this chapter and sort it into the sandwich: say whether it belongs in the empirical slice or the verdict, and what evidence or value would change your mind about it.

Misconception check. Students often think the falling poverty count proves that globalization was a net good, or that the closed mills prove it was not. That is tempting, because each side has one vivid fact. But a net judgment weighs many findings against values, and the timing of a decline is a correlation, not a cause. The verdict is yours, and your reasons are what count.

Memory hook: facts on the bottom, values in the middle, your verdict on top.

Look back at what the course has built since Week 1. You learned to name the kind of claim, to read the evidence for what it shows and does not, and to state the other side at full strength before you argue your own. Those habits are the course.

Key terms

political economy — The study of how politics and economics shape each other: how states set the rules that markets run on, and how markets shape who holds power. (first used: 1. Find the seam: political economy and the mixed economy)
mixed economy — An economy in which markets and the state both decide what is made and who gets it; every real economy is mixed, and economies differ in the mix and the institutions that carry it. (first used: 1. Find the seam: political economy and the mixed economy)
varieties of capitalism — A classroom model that sorts market economies by how firms coordinate with one another, describing liberal market economies and coordinated market economies without ranking them. (first used: 2. Describe without ranking: the varieties of capitalism)
liberal market economy — A market economy in which firms coordinate mainly through competitive markets, using prices, contracts, and short-term hiring. (first used: 2. Describe without ranking: the varieties of capitalism)
coordinated market economy — A market economy in which firms coordinate through employer associations, unions, and long-term relationships with banks and other firms rather than mainly through markets. (first used: 2. Describe without ranking: the varieties of capitalism)
opportunity cost — What you give up to make or do one thing instead of another, such as the cloth a country could have made with the hours it spends on grain. (first used: 3. Work the logic: comparative advantage)
comparative advantage — The descriptive claim that countries gain in total when each specializes in what it gives up less to make, even if one country is faster at making everything. (first used: 3. Work the logic: comparative advantage)
specialization — Concentrating work on the goods a person or country makes at a lower opportunity cost and trading for the rest. (first used: 3. Work the logic: comparative advantage)
trade policy — The rules a government sets for goods crossing its border, such as tariffs, quotas, and trade agreements. (first used: 4. Weigh the findings: trade policy)
aggregate gains — The total gain that trade brings to an economy taken as a whole, before asking who receives it. (first used: 4. Weigh the findings: trade policy)
distributional costs — The losses from trade that fall on particular workers, firms, and towns, which can be concentrated and slow to heal even when the economy gains in total. (first used: 4. Weigh the findings: trade policy)
free trade — A trade policy position favoring fewer barriers to goods crossing borders, on the argument that the aggregate gains are large and the losers can be helped through other policies. (first used: 4. Weigh the findings: trade policy)
managed trade — A trade policy position favoring deliberate limits or conditions on trade, on the argument that its costs land hard on particular communities that a government owes protection. (first used: 4. Weigh the findings: trade policy)
poverty — Having too little income or consumption to meet a stated threshold, measured as the share of people below a poverty line. (first used: 5. Pull apart two words: poverty versus inequality)
poverty line — The income or consumption level a measurer chooses as the threshold of poverty; it is a definition, so it can be set differently and can change over time. (first used: 5. Pull apart two words: poverty versus inequality)
inequality — The spread of a whole distribution of income or wealth, meaning how far apart the people at the top and the bottom sit. (first used: 5. Pull apart two words: poverty versus inequality)
between-country inequality — The gap between different countries' average incomes, treating each country as one unit. (first used: 5. Pull apart two words: poverty versus inequality)
within-country inequality — The gap in income or wealth among the people who live inside one country. (first used: 5. Pull apart two words: poverty versus inequality)
International Poverty Line — The World Bank's line for extreme poverty, 3.00 dollars a day in 2021 international prices, which in June 2025 replaced the earlier line of 2.15 dollars a day in 2017 prices. (first used: 6. Define the line: the International Poverty Line)
extreme poverty — Living below the World Bank's International Poverty Line, the lowest threshold it uses to count the world's poor. (first used: 6. Define the line: the International Poverty Line)
international prices — Prices adjusted so that a dollar buys the same basket of goods in every country, the base in which a global poverty line is set. (first used: 6. Define the line: the International Poverty Line)
collective-action problem — A situation in which every member of a group would gain if all cooperated, yet each member does better by letting the others pay the cost. (first used: 8. Name the trap: climate change as a collective-action problem)
free rider — A member of a group who enjoys a shared benefit without paying any of its cost. (first used: 8. Name the trap: climate change as a collective-action problem)
carbon pricing — A policy that puts a charge on each unit of greenhouse gas emitted, so that emitters pay for the harm and choose where to cut. (first used: 8. Name the trap: climate change as a collective-action problem)
adaptation — Changes that reduce the harm of a warming already under way, such as stronger flood defenses, rather than cutting the emissions that cause it. (first used: 8. Name the trap: climate change as a collective-action problem)
migration — The movement of people across borders to live, studied as empirical questions about who moves, why, and with what effects, kept apart from the normative question of what policy a country ought to adopt. (first used: 9. Keep the layers apart: migration)
globalization — The growing flow of goods, money, people, and ideas across national borders. (first used: 10. Close the arc: has globalization been a net good?)

Summary

Political economy works at the seam of comparative politics, international relations, and theory; every real economy is a mixed economy.
The varieties-of-capitalism model sorts liberal and coordinated market economies by how firms coordinate, and it ranks neither.
Comparative advantage runs on opportunity cost, not speed: two countries gain in total by specializing.
Trade brings aggregate gains and distributional costs; trade policy is the normative weighing of the two.
Poverty is a threshold and inequality is a spread; they can move in opposite directions.
The International Poverty Line is 3.00 dollars a day in 2021 international prices, set in June 2025 in place of 2.15 dollars in 2017 prices.
Around 831 million people lived in extreme poverty in 2025, down from around 2.3 billion in 1990; the chart shows the fall, not its cause.
Climate change is a collective-action problem: the physical basics are settled, and the policy choices are argued.
Migration patterns are empirical questions; admission policy is normative.
Whether globalization has been a net good is your verdict to argue, with the other side stated first.

Check your understanding

Work these before looking at the answers — they are ungraded, and the answers (with reasoning) are at the bottom of the page.

On two made-up islands, Wrenna makes 1 basket of fish in 3 hours and 1 basket of fruit in 1 hour, while Oskarra makes 1 basket of fish in 4 hours and 1 basket of fruit in 4 hours. Which island should specialize in fish, and why, even though Wrenna is faster at both? Show the opportunity costs.
A made-up village of 10 households goes from 4 households below its line to 2, while the top household's income goes from 3 times the bottom household's to 6 times. What happened to poverty, in percent and percentage points, and what happened to inequality?
Four made-up farms share a well. Repairing it costs one farm 9 units, and each repair gives 3 units of benefit to each of the 4 farms. Work out a farm's net if it repairs alone, each farm's net if all 4 repair, and the free rider's net if 3 repair. Why might the well go unrepaired?
Sort each statement as empirical, normative, or a causal claim with no argument: (a) "In a made-up country, the share below the national line fell from 18 to 12 percent between two surveys." (b) "Trade agreements ought to protect workers before consumers." (c) "The fall proves the new trade deal worked."

Answers (worked reasoning — read after attempting)

Oskarra should specialize in fish. In Wrenna, 1 basket of fish costs 3 ÷ 1 = 3 baskets of fruit. In Oskarra, 1 basket of fish costs 4 ÷ 4 = 1 basket of fruit. Oskarra gives up less to make fish (1 basket of fruit against 3), so fish is its comparative advantage, and Wrenna, which gives up only a third of a basket of fish for each basket of fruit, should make fruit. Speed does not decide it; opportunity cost does.
Poverty fell from 4 ÷ 10 × 100 = 40 percent to 2 ÷ 10 × 100 = 20 percent, a fall of 40 − 20 = 20 percentage points. Inequality rose, because the top-to-bottom gap grew from 3 times to 6 times. The village became less poor and more unequal at once, which is why poverty and inequality are two different measures.
Alone, a farm gets back 3 and pays 9, so 3 − 9 = −6. If all 4 repair, each receives 3 × 4 = 12 and pays 9, so 12 − 9 = 3. If 3 repair, the free rider receives 3 × 3 = 9 and pays nothing, so 9, while each repairer gets 9 − 9 = 0. Each farm does better free riding (9 against 3), so if every farm reasons that way, no one repairs and each gets 0. That is a collective-action problem.
(a) is empirical. It reports a change you could check against the two surveys, and its base is the country's population. (b) is normative: it says what trade agreements ought to do and has to be argued from values. (c) is a causal claim with no argument behind it. The fall in (a) happened, but timing alone does not show the trade deal caused it; something else could have moved the share. This is the correlation trap from section 7.

Next up in this module: the Readings & Resources page, the lecture tutorial, the practice set, and the quiz — and next week, the finals week brings the Final Practice Exam and the final, testing the habits of the whole course rather than a new model.

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