---
title: "Income Inequality — AP Comp Gov Definition & Exam Guide"
description: "Income inequality is the uneven distribution of income and wealth in a society. In AP Comp Gov it fuels class cleavages, voting behavior, and instability (Topic 3.8)."
canonical: "https://fiveable.me/ap-comp-gov/key-terms/income-inequality"
type: "key-term"
subject: "AP Comparative Government"
unit: "Unit 3"
---

# Income Inequality — AP Comp Gov Definition & Exam Guide

## Definition

In AP Comparative Government, income inequality is the unequal distribution of income and wealth among members of a society. It creates class-based social cleavages (Topic 3.8) that shape voting behavior, party systems, and political stability in the six course countries.

## What It Is

Income inequality is the gap between a society's haves and have-nots, the unequal distribution of income and wealth across groups. In [AP Comp Gov](/ap-comp-gov "fv-autolink"), you don't study it as an economics statistic. You study it as the raw material for a **class [cleavage](/ap-comp-gov/key-terms/cleavage "fv-autolink")**, one of the four cleavage types named in the CED (class, ethnicity, religion, territory) under LEG-2.A.1.

The key move is connecting the economic gap to a political division. When some regions or groups consistently earn far more than others, people start to vote, protest, and organize around that gap. In [China](/ap-comp-gov/review-by-country/china/study-guide/K0v3iydFqTXwWWKj "fv-autolink"), for example, the coastal areas have developed much faster than the interior, so economic inequality overlaps with regional and ethnic divisions. That overlap is exactly what the CED means when it says cleavages are 'internal divisions that structure societies.' Income inequality is one of the most common ways those divisions get structured.

## Why It Matters

Income inequality lives in **Topic 3.8 (Political and Social Cleavages)** in **[Unit 3](/ap-comp-gov/unit-3 "fv-autolink"): Political Culture and Participation**. It supports two learning objectives. **AP Comp Gov 3.8.A** asks you to describe politically relevant social cleavages, and class (driven by income inequality) is one of the four cleavage bases the CED lists alongside ethnicity, [religion](/ap-comp-gov/key-terms/religion "fv-autolink"), and territory. **AP Comp Gov 3.8.B** asks you to explain how cleavages affect citizen relationships and political stability. Per LEG-2.B.1, cleavages shape voting behavior, party systems, and informal political networks, and per LEG-2.B.2, governments respond in very different ways, from repression to recognition. Income inequality also reaches forward into Unit 5, where economic liberalization and development indicators (like the Gini coefficient) measure and often widen the gap. If you can trace inequality from an economic fact to a political consequence, you're doing exactly what the exam rewards.

## Connections

### [Cleavage (Unit 3)](/ap-comp-gov/key-terms/cleavage)

Income inequality is the condition; a class cleavage is what it becomes when people organize politically around it. Think of [inequality](/ap-comp-gov/unit-5/policies-economic-liberalization/study-guide/ediBJluYzYdzotmy82R0 "fv-autolink") as the fuel and the cleavage as the fire. The CED's four cleavage bases are class, ethnicity, religion, and territory, and income inequality drives the first one.

### [Coinciding Cleavages (Unit 3)](/ap-comp-gov/key-terms/coinciding-cleavages)

Income inequality gets politically explosive when it stacks on top of another division. In China, poorer interior regions overlap with ethnic minority populations like the Uighurs and Tibetans, while the wealthier coast is majority Han. When the rich-poor line and the ethnic line are the same line, instability risk goes way up.

### [Voting Behavior (Unit 3)](/ap-comp-gov/key-terms/voting-behavior)

LEG-2.B.1 says cleavages affect [voting behavior](/ap-comp-gov/key-terms/voting-behavior "fv-autolink") and party systems. Class is a classic example. Parties often build their base around income groups, promising redistribution to poorer voters or market-friendly policies to wealthier ones, so inequality literally shapes who wins elections.

### Economic Liberalization and the Gini Coefficient (Unit 5)

[Unit 5](/ap-comp-gov/unit-5 "fv-autolink") gives you the measurement tool. The Gini coefficient (or Gini index) quantifies income inequality, and market reforms like China's economic liberalization often grow the economy while widening the gap. This is the cross-unit link the exam loves, where a Unit 5 economic policy creates a Unit 3 political cleavage.

## On the AP Exam

Income inequality shows up as the economic side of cleavage questions. The College Board's 2018 SAQ Q6 stated directly that 'social and economic cleavages often divide society and can have both positive and negative political consequences,' then asked for descriptions and country-specific explanations. That's the template. Expect multiple-choice stems asking you to identify which cleavage type a scenario describes (a gap between rich coastal cities and a poor rural interior is a class plus territorial cleavage), and free-response prompts asking you to explain how an economic cleavage affects political stability or government response in a specific course country. The skill being tested is the causal chain. Don't just say 'China has income inequality.' Say what the inequality is, which groups it divides, and what political consequence follows, like protest, regime legitimacy challenges, or targeted government investment in poorer regions.

## income inequality vs Class cleavage

Income inequality is an economic condition, the measurable gap in income and wealth. A class cleavage is the political division that forms when people identify and act based on that gap. Inequality can exist without becoming a cleavage if it isn't politically activated, but on the exam, cleavage questions usually want you to show inequality being translated into voting patterns, party competition, or unrest. Use 'income inequality' to describe the gap and 'class cleavage' to describe the political division it produces.

## Key Takeaways

- Income inequality is the unequal distribution of income and wealth in a society, and in AP Comp Gov it is the engine behind class-based cleavages in Topic 3.8.
- Class is one of the four cleavage bases named in LEG-2.A.1, alongside ethnicity, religion, and territory.
- Income inequality becomes most politically destabilizing when it coincides with other cleavages, like China's wealthier Han coast versus its poorer ethnic-minority interior regions.
- Per LEG-2.B.1, cleavages built on inequality shape voting behavior, party systems, and informal political networks across the course countries.
- Governments respond to inequality-driven cleavages in different ways, ranging from repression to recognition and investment, which is the comparison LEG-2.B.2 sets up.
- The Gini coefficient from Unit 5 is how you measure income inequality, so be ready to connect economic data to political consequences across units.

## FAQs

### What is income inequality in AP Comparative Government?

It's the unequal distribution of income and wealth among members of a society. In the course, it matters because it creates class cleavages (Topic 3.8) that affect voting behavior, party systems, and political stability in the six course countries.

### Is income inequality the same thing as a social cleavage?

Not quite. Income inequality is the economic gap itself, while a cleavage is the political division that forms when groups organize around that gap. The exam usually wants you to show the inequality being translated into political behavior, not just state that the gap exists.

### Does income inequality always cause political instability?

No. Inequality raises the risk of instability, especially when it coincides with ethnic, religious, or territorial divisions, but governments can manage it through redistribution, regional investment, or recognition of minority groups. The 2018 SAQ even noted cleavages can have both positive and negative political consequences.

### How is income inequality measured on the AP Comp Gov exam?

The Gini coefficient (or Gini index), which appears in Unit 5 as a development indicator. A higher Gini means a more unequal income distribution, and you can use it as evidence when comparing course countries.

### How does income inequality show up in China for AP Comp Gov?

China's coastal regions have developed far faster than the interior, creating a regional income gap that overlaps with ethnic divisions between the Han majority and minorities like the Uighurs and Tibetans. That coinciding cleavage is one of the CED's go-to examples in Topic 3.8.

## Related Study Guides

- [3.8 Political and Social Cleavages](/ap-comp-gov/unit-3/political-social-cleavages/study-guide/3F6Q77Ww8izUo8Dbk6yb)

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