In AP Microeconomics, mobility is the ability of individuals to move up or down the income or wealth distribution, either within their own lifetime (intragenerational) or compared to their parents (intergenerational). Low mobility is listed in the CED as a source of income and wealth inequality (Topic 6.5).
Mobility answers a simple question that a snapshot of inequality can't: can people actually change where they sit in the income distribution? Intragenerational mobility is movement within one lifetime, like starting in the bottom 20% of earners at age 22 and ending up in the middle by age 45. Intergenerational mobility is movement across generations, like a kid earning more (or less) than their parents did.
In the AP Micro CED, mobility shows up in EK POL-5.B.2 as one of the listed sources of income and wealth inequality, alongside human capital, social capital, inheritance, discrimination, access to financial markets, tax structures, and bargaining power. The logic runs like this. If mobility is low, families that start poor tend to stay poor, and families that start rich tend to stay rich, so inequality persists and even compounds over time. Notice that mobility interacts with the other sources on the list. A family with little inherited wealth, weak access to financial markets, and limited human capital investment has fewer ladders to climb, which is exactly why low mobility tends to cluster in certain groups and neighborhoods.
Mobility lives in Topic 6.5 (Inequality) in Unit 6: Market Failure and the Role of Government. It directly supports learning objective 6.5.B, which asks you to explain sources of income and wealth inequality, and it pairs with 6.5.A, which covers how inequality is measured. The big payoff is conceptual. The Lorenz curve and Gini coefficient measure inequality at a moment in time, but mobility explains whether that inequality is sticky. Two countries can have the same Gini coefficient and very different mobility, and the one where people can't move between income levels has the deeper inequality problem. The exam rewards you for being able to name mobility as a cause of inequality, not just describe inequality itself.
Keep studying AP® Microeconomics Unit 6
Gini Coefficient (Unit 6)
The Gini coefficient is a snapshot of inequality at one point in time, while mobility is the movie. Low mobility means today's Gini snapshot will keep looking the same year after year, because the same households stay stuck at the same income levels.
Discrimination (Unit 6)
Discrimination is another EK POL-5.B.2 source of inequality, and it directly suppresses mobility. If certain groups face barriers in hiring, lending, or housing, their members can't convert effort and education into upward movement, so low mobility becomes a group pattern rather than individual bad luck.
Marginal Revenue Product and Factor Markets (Unit 5)
EK POL-5.B.1 says each factor of production earns the value of its marginal product. Mobility connects here through human capital. Education raises your marginal product, which raises your wage, which is the main mechanism by which individuals move up the income distribution.
Labor Unions (Units 5-6)
Unions show up in EK POL-5.B.2 as bargaining power within economic units. Stronger bargaining power can lift wages for workers near the bottom, which is one channel for intragenerational mobility within a working lifetime.
Mobility is tested in multiple-choice questions, usually in two ways. First, source-of-inequality questions ask you to identify which factors do or don't contribute to economic inequality, and mobility (or the lack of it) is a correct CED-listed source. Second, scenario questions describe a pattern, like families in certain neighborhoods showing persistently low intergenerational mobility, and ask you to pick the combination of factors that explains it (think low human capital investment, weak access to financial markets, and discrimination working together). You may also see mobility tied to opportunity cost analysis, like a person weighing the cost of college against the higher future income it unlocks. No released FRQ has used this term verbatim, but Topic 6.5 content can anchor a free-response part asking you to explain why inequality persists. Note the CED exclusion for this topic. You will never be asked to draw a Lorenz curve or calculate a Gini coefficient.
Inequality describes how income or wealth is distributed right now, while mobility describes whether people can change their position in that distribution over time. They're related but separate. A country can have high inequality with high mobility (big gaps, but people move between levels) or high inequality with low mobility (big gaps that get inherited). On the exam, the Gini coefficient measures inequality, and low mobility is one of the reasons inequality persists.
Mobility is the ability to move between income or wealth levels, and the CED lists low mobility as a source of income and wealth inequality in Topic 6.5 (EK POL-5.B.2).
Intergenerational mobility is movement across generations, like earning more than your parents, while intragenerational mobility is movement within your own lifetime.
Inequality is a snapshot measured by the Lorenz curve and Gini coefficient, but mobility tells you whether that snapshot is stuck or changing.
Low mobility clusters with other inequality sources like limited human capital, lack of inheritance, discrimination, and poor access to financial markets, which is why some neighborhoods show persistently low intergenerational mobility.
Education drives mobility because it builds human capital, which raises a worker's marginal product and therefore their wage in factor markets.
Mobility is the ability of individuals to move between income or wealth levels, either within a lifetime (intragenerational) or across generations (intergenerational). It appears in Topic 6.5 as one of the CED-listed sources of income and wealth inequality under EK POL-5.B.2.
Intergenerational mobility compares your economic position to your parents' position, like a child of low-income parents reaching the middle class. Intragenerational mobility is movement within your own lifetime, like climbing from the bottom income quintile in your 20s to a higher one by your 40s.
No. Inequality measures how unevenly income or wealth is distributed at a point in time, while mobility measures whether people can change their position in that distribution. Low mobility is a reason inequality persists, which is why the CED lists it as a source of inequality rather than a measure of it.
Not necessarily. Two countries can have the same Gini coefficient but very different mobility, since the Gini only captures a snapshot of the distribution. That said, on the exam, low mobility is one explanation for why high inequality persists over time.
No. The CED explicitly excludes drawing the Lorenz curve and calculating Gini coefficients, and there's no mobility formula in the course. You need to define mobility, distinguish the two types, and explain how low mobility contributes to income and wealth inequality.
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