Q.Explain the circular flow of income in a two-sector economy with the help of a diagram.

In a two-sector economy of households and firms, income and spending move in a continuous circle — households supply factors and receive incomes, then spend those incomes buying firms' output.

Because one sector's spending is the other's income, in the simplest case Income = Output = Expenditure, flowing round a closed circle.

A two-sector economy has just two sectors: HOUSEHOLDS, who own all the factors of production (land, labour, capital and enterprise), and FIRMS, who produce all the goods and services. It is assumed there is no government and no foreign trade, and that households spend the whole of their income (there is no saving).

There are two flows, running in OPPOSITE directions:

The real flow. Households supply factor services — the use of their land, labour and capital — to firms, and firms in return supply finished goods and services to households. This is a flow of real things (factors one way, products the other).

The money flow. In exchange for factor services, firms pay households factor incomes — rent for land, wages for labour, interest for capital and profit for enterprise. Households then spend this income buying goods and services from firms (consumption expenditure). This is a flow of money, running in the opposite direction to the real flow.

Two-sector circular flow, summarised:

The key insight is that one sector's spending is the other sector's income. The money firms pay out as factor incomes comes back to them as households' consumption expenditure, which they use again to pay for factor services — so the flow is a closed, self-sustaining circle. In this simplest model, the total factor income paid by firms equals the total expenditure by households, which equals the total value of output produced:

This identity — income equals output equals expenditure — is the foundation of the three methods of measuring national income studied later.

Two common errors: (1) drawing only ONE flow instead of the two opposite flows — the real flow and the money flow must both be shown, running in opposite directions; (2) introducing saving, government or foreign trade into the two-sector model, when the whole point of the two-sector case is that these are ASSUMED AWAY (households spend all their income).