Circular flows, income and wealth
| English | Français |
|---|---|
| net wealth | net wealth |
| income flow | income flow |
A decision you can investigate
- A worker supplies labour and receives wages. A household buys output and the firm receives sales revenue. These are linked transactions, not separate additions to national income each time money passes a boundary.
- A stock of savings differs from the income received this month.
Build the explanation
- In a simple circular flow, households supply factors to firms and receive factor incomes; firms supply goods/services and receive household expenditure. Real resources and money payments move in opposite directions for each exchange. The model shows the relationship between production, income and expenditure without counting every linked payment as another final product.
- Income is a flow measured over a period. Wealth is a stock of assets less liabilities measured at a date. A household can receive income from using its assets, but the asset’s market value and its income are different measures. A gain in the value of an existing asset is not itself new production. Add government, financial intermediation and foreign transactions only after explaining what each changes.
Work through the evidence
- A fictional household has assets 12000 and debts 3000 on 1January, so net wealth 净财富=12000−3000=9000. During a month it receives wages 1000 and rental income 100, a total income flow 收入流量 1100; it spends 900 and saves 200 under the stated account. If all 200 increases assets and debts stay 3000, end-month net wealth becomes 9200, with other changes excluded.
- The 9200 stock is not monthly income. If an existing asset instead rises 500 in price without new production, net wealth may rise another 500, but adding that capital gain to measured GDP would confuse an asset revaluation with current output. In the two-sector diagram, factor income supports spending and firm receipts support factor payments; treat the linked flows consistently.
What is initial net wealth?
Subtract liabilities 3000 from assets 12000.
What is stated monthly income?
Wages 1000 plus rental income 100 equals 1100.
Income and wealth are interchangeable measures whenever both are expressed in currency.
Income is measured over time; wealth is measured at a date.
Test the limits
- Savings can accumulate into wealth, but revaluation, depreciation, gifts and debt changes also affect a balance sheet. A high-income household can have little net wealth, while a low-current-income household can own valuable assets. Gross assets and net wealth differ when debts exist.
- The simple model omits saving, tax and international flows; the next lesson adds these rather than claiming all income must always be consumed. Informal and unpaid work complicate measurement. Specify a date for wealth and a period for income before interpreting household or national data.
What does a 500 asset-price gain establish by itself?
A price change for an existing asset differs from current production.
Apply and explain your answer
- Why must wages received in a month not be compared directly with a household’s total wealth as if they were the same kind of amount?
- Wages are a flow over that month; wealth is a net stock at a date. They answer different questions even if both use currency units.
Match the terms to their meanings.
Use each term for its stated economic relationship.
Use the terms precisely
- income flow: Income received over a specified period.
- net wealth: Assets less liabilities at a specified date.
A fictional household has assets 12000 and debts 3000 on 1January, so net wealth=12000−3000=9000. During a month it receives wages 1000 and rental income 100, a total income flow 1100; it spends 900 and saves 200 under the stated account. If all 200 increases assets and debts stay 3000, end-month net wealth becomes 9200, with other changes excluded. The 9200 stock is not monthly income. If an existing asset instead rises 500 in price without new production, net wealth may rise another 500, but adding that capital gain to measured GDP would confuse an asset revaluation with current output. In the two-sector diagram, factor income supports spending and firm receipts support factor payments; treat the linked flows consistently.
Savings can accumulate into wealth, but revaluation, depreciation, gifts and debt changes also affect a balance sheet. A high-income household can have little net wealth, while a low-current-income household can own valuable assets. Gross assets and net wealth differ when debts exist. The simple model omits saving, tax and international flows; the next lesson adds these rather than claiming all income must always be consumed. Informal and unpaid work complicate measurement. Specify a date for wealth and a period for income before interpreting household or national data.
In a simple circular flow, households supply factors to firms and receive factor incomes; firms supply goods/services and receive household expenditure. Real resources and money payments move in opposite directions for each exchange. The model shows the relationship between production, income and expenditure without counting every linked payment as another final product.