Key definitions

• Equity = fairness in the distribution of income and wealth; it is not the same as equality.

• Equality = a more equal distribution of income or wealth.

• Income = a flow of earnings over time, such as wages, rent, interest, and profit.

• Wealth = a stock of assets owned at a point in time, such as property, shares, savings, and land.

• Free market economy = resources are allocated mainly through price signals and private ownership.

Why free markets may fail to achieve equity

• In a free market, households earn income according to the factors of production they own and how valuable these are in the market.

• People do not start with equal ownership of land, capital, or entrepreneurial ability.

• Workers have different levels of human capital such as education, skills, training, and experience, so their wages differ.

• Owners of capital can receive interest, dividends, rent, and profit, so those with more assets often gain more income even without working more hours.

• Inheritance can transfer wealth across generations, making inequality persist over time.

• Differences in bargaining power, market power, and discrimination can worsen inequality.

• As a result, the market may reward people very differently, producing an outcome that may be efficient but seen as inequitable.

How income inequality can turn into wealth inequality

• Higher-income households can usually save more.

• More savings allow greater investment in assets such as property, businesses, pensions, or shares.

• These assets then generate further income, which increases wealth over time.

• Lower-income households may be unable to save much, so they struggle to build wealth.

• This creates a cycle: higher income → more saving/investment → more wealth → even higher future income.

• In exam answers, show that wealth inequality is often more persistent than income inequality.

Using the circular flow model to explain inequality

• In the factor market, households provide land, labour, capital, and entrepreneurship to firms.

• Firms pay households wages, rent, interest, and profit for these resources.

• Because households own different amounts and types of resources, they receive different levels of income.

• Households with more capital and land often receive more property income, not just labour income.

• High-income households can then spend, save, and invest more, increasing future claims on income.

• Therefore, the circular flow helps explain why a free market can produce persistent inequalities in income and wealth.

• A strong exam line: unequal resource ownership in the factor market leads to unequal income flows in the product and factor markets.

This circular flow diagram shows money and real flows between households and firms. It is useful for explaining that households receive different incomes depending on the factors of production they own. That helps link free market outcomes to inequality. Source

This version of the circular flow highlights goods, services, and factor payments between firms and households. Use it to show where wages, rent, interest, and profit enter the model. These flows are the basis for explaining unequal income distribution. Source

What examiners want you to explain

• Why free markets may produce unequal outcomes.

• The difference between income and wealth inequality.

• How factor ownership affects earnings in a market economy.

• Why unequal income today can cause greater wealth inequality in the future.

• Why a market outcome can be allocatively efficient yet still not equitable.

Evaluation points to add for higher marks

• A free market may create incentives for work, innovation, and risk-taking, but this does not guarantee fairness.

• Some inequality may be seen as acceptable if it reflects productivity differences, but very high inequality may reduce economic well-being and social cohesion.

• The extent of inequity depends on how unequal asset ownership, education access, and opportunities are in the economy.

• In evaluation, avoid saying markets are always unfair; argue that markets may be efficient while still failing to achieve equity.

Interpreting inequality diagrams and evidence

• If shown a Lorenz curve, a curve further from the line of equality indicates greater inequality.

• A higher Gini coefficient means a more unequal distribution of income or wealth.

• Even if no Lorenz curve appears in the question, you can still explain inequality using the circular flow model and factor ownership.

• Link any data to the syllabus wording: the market may be unable to achieve equity because rewards are based on market value, not fairness.

This Lorenz curve shows how actual income distribution can diverge from perfect equality. The more bowed the curve, the greater the inequality. It is useful evidence when explaining why markets may not achieve equity. Source

This diagram combines a Lorenz curve with the Gini coefficient to show global income inequality. It helps students connect a visual measure of inequality with the idea that market outcomes can be very uneven. Use it when discussing how far real distributions can move away from equity. Source