Q.Explain the circular flow of income in a simple two-sector economy consisting only of households and firms.

In the simplest economy, income and expenditure move continuously between just two sectors, in opposite directions.

In a two-sector economy, there are only two decision-making units: households, who own all factors of production (land, labour, capital, enterprise), and firms, who use those factors to produce goods and services.

Two flows move continuously, in opposite directions, between them:

• Real flow — households supply factor services to firms; firms, in return, supply finished goods and services back to households.
• Money flow — firms pay households factor incomes (wages, rent, interest, profit) in exchange for the factor services received; households, in turn, spend that income buying goods and services, so the money returns to firms as revenue.

Because every rupee one sector spends becomes income for the other sector, this flow is genuinely circular — it has no natural starting or ending point. In this simplified two-sector model, with no saving, no government, and no foreign trade, the entire household income is spent on firms' output and the entire firm revenue is paid out as factor income, so the flow — and the level of national income — continues at a constant level period after period.

Students often describe only one of the two flows (usually just the money flow) and forget to mention the accompanying real flow of factor services and goods, which is equally part of a complete answer.