In the circular flow of income model, the three letters that represent leakage are:
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S - Savings: When households save part of their income instead of spending it, this money is taken out of the flow of income.
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T - Taxes: Taxes collected by the government represent a leakage from households and businesses that reduces the amount of money available for consumption and investment.
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M - Imports: When a country imports goods and services, money flows out of the domestic economy, leading to a leakage from the circular flow.
These leakages can reduce the overall level of economic activity if not offset by injections (like investments, government spending, or exports).