Q.(a) Discuss briefly the concept of circular flow of income in a two-sector model.

1. Circular Flow of Income in a Two-Sector Model In a simple two-sector economy (households and firms, with no government or external trade), the circular flow of income shows how money and real resources move between these two agents. Households supply factors of production (land, labour, capital, entrepreneurship) to firms and receive factor payments (rent, wages, interest, profit) in return — this is the income flow. Firms use these factors to produce goods and services, which households purchase with their income — this is the expenditure flow. The two flows are equal in value: what households earn as income is exactly what they spend as consumption expenditure, and firms receive that same amount as revenue. This creates a continuous, circular movement of income and output, with no leakages or injections in the basic model.
   Note

   In a closed two-sector model, National Income = Consumption = Expenditure, so $Y = C$.

2. Real GDP vs. Nominal GDP as an Indicator of Economic Growth Yes, I agree. Real GDP is a better indicator because it measures the value of output at constant prices, isolating changes in physical production from changes in price levels. Nominal GDP, on the other hand, can rise purely due to inflation even if actual output remains unchanged, giving a misleading picture of growth. Hypothetical Numerical Example: Suppose a country produces only one good — wheat. | Year | Quantity (kg) | Price (₹/kg) | Nominal GDP | Real GDP (base year = 2020) | |------|---------------|--------------|-------------|-----------------------------| …

(a) The Circular Flow of Income in a Two-Sector Model

Think of an economy as a simple, closed loop — like blood circulating in the body. In the two-sector model, we have only two economic agents: households and firms. There is no government, no foreign trade, and no savings (for now). The entire income flows in a circle.

Here’s how it works:

• Households own all factors of production — land, labour, capital, and entrepreneurship. They supply these to firms.
• Firms use these factors to produce goods and services. In return, they pay factor payments to households: rent, wages, interest, and profit.
• Households receive this income and spend it all on buying the goods and services produced by firms. This spending becomes revenue for firms.
• Firms then use that revenue to pay households again for their factor services — and the cycle repeats.

The key insight? One person’s spending is another person’s income. The value of what is produced (GDP) equals the total income earned, which also equals the total expenditure in the economy. This identity — $Y = C$ — is the foundation of national income accounting.

If you draw this, you’d see two flows moving in opposite directions: a real flow of factors and goods (labour goes from households to firms; goods go from firms to households) and a money flow of payments (income from firms to households; spending from households to firms). They are two sides of the same coin.

(b) Real GDP vs Nominal GDP — Which is the Better Indicator?

Yes, I agree completely. Real GDP is a better indicator of economic growth than Nominal GDP. Here’s why.

Nominal GDP is the market value of all final goods and services produced in a year, measured at current year prices. So if prices rise (inflation), Nominal GDP can increase even if the actual quantity of goods produced stays the same — or even falls. That’s misleading.

Real GDP is measured at constant base year prices. It strips out the effect of price changes and shows only the change in the physical volume of output. That’s what we mean by economic growth — producing more stuff, not just charging more for the same stuff.

Hypothetical Numerical Example

Let’s take a simple economy that produces only one good — say, wheat. …