In a simple circular-flow diagram, total income and total expenditure are

Question

BlackTom AI · Accepted Answer

In the circular-flow model, each dollar a buyer spends becomes income for a seller, so total expenditure equals total income.

1. Relevant knowledge points and concepts
- Circular-flow diagram: represents flows of goods/services and factors of production between households and firms, and the corresponding monetary flows.
- Two key flows: real (goods and services, labor) and monetary (payments for goods, wages/rents/profits).
- National accounting identity: in an economy, aggregate expenditure equals aggregate income; GDP can be measured by total spending (expenditure approach) or by total income (income approach).

2. Step-by-step reasoning
- Households buy goods/services from firms; the money households spend is revenue for firms.
- Firms use revenue to pay wages, rent, interest and profits to households (factor payments). Those payments are household income.
- Households then spend income on goods/services again or save it; if they spend, that becomes firms’ revenue again.
- Thus every market transaction has both a buyer (expenditure) and a seller (income recipient). Summing all transactions, the sum of expenditures equals the sum of incomes.

3. Calculation example (intermediate steps)
- Suppose in a simple economy: households spend $100 on consumption.
- Firms receive revenue: +$100 (aggregate expenditure = $100).
- Firms pay households wages/profits totaling $100 (aggregate income = $100).
- Therefore aggregate expenditure = $100 and aggregate income = $100, so they are equal.

4. Why the correct answer is correct
- The identity holds by accounting definition: money spent by buyers must be received by sellers. In the closed circular-flow without measurement errors, leakages or statistical discrepancies, total income must equal total expenditure.

5. Why the other options are incorrect
- “Equal only when the government purchases no goods or services”: government transactions simply redirect flows; the identity still holds when government is included because government spending is both expenditure and someone’s income.
- “Seldom equal because of changes in unemployment”: unemployment affects levels of income and expenditure but not the accounting identity that their aggregates are equal.
- “Never equal because total income always exceeds total expenditure”: incorrect—there is no systematic excess of income over expenditure; each transaction balances.

Conclusion: Therefore the correct choice is “always equal because every transaction has a buyer and a seller,” which matches the provided answer.

In a simple circular-flow diagram, total income and total expenditure are单项选择题

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