The circular flow of income shows how money moves through an economy as people buy, sell, earn, save, and pay taxes. Households provide labor and other resources to businesses, and businesses use those resources to produce goods and services. In return, households earn income such as wages, rent, interest, and profit.
This model matters because it helps students see how one person’s spending can become another person’s income.
Key Facts
- Households earn income by selling resources such as labor, land, capital, and entrepreneurship.
- Businesses earn revenue by selling goods and services to households, government, and foreign buyers.
- In a simple closed economy, total income = total spending = total output.
- GDP = C + I + G + (X - M), where C is consumption, I is investment, G is government spending, X is exports, and M is imports.
- Leakages from the flow include saving, taxes, and imports because they reduce spending on domestic goods and services.
- Injections into the flow include investment, government spending, and exports because they add spending to the economy.
Vocabulary
- Circular flow of income
- A model that shows how money, resources, goods, and services move among households, businesses, government, banks, and the foreign sector.
- Households
- People or families who supply resources to businesses and use income to buy goods and services.
- Businesses
- Firms that use resources to produce goods and services and pay income to households.
- Leakage
- Money that leaves the main spending flow through saving, taxes, or imports.
- Injection
- Money that enters the spending flow through investment, government spending, or exports.
Common Mistakes to Avoid
- Confusing money flows with real flows: money moves one direction while goods, services, and resources move the opposite direction.
- Counting imports as a direct addition to domestic production: imports are subtracted in GDP because they are produced in another country.
- Forgetting that saving can return through banks: saving is a leakage at first, but financial institutions can turn it into investment loans.
- Assuming government only takes money out: taxes are a leakage, but government spending is an injection that pays for goods, services, wages, and transfers.
Practice Questions
- 1 A household earns 2,400 on goods and services, saves 300 in taxes. How much of its income is a leakage from the circular flow?
- 2 An economy has consumption of 180 billion, government spending of 120 billion, and imports of $160 billion. Calculate GDP using GDP = C + I + G + (X - M).
- 3 Explain how a $1,000 car repair bill paid by a household can move through at least three parts of the circular flow of income.