National Income

National Income

🟢 Lite — Quick Review (1h–1d)

Rapid summary for last-minute revision before your exam.

National Income is the total monetary value of all final goods and services produced by residents of a country during an accounting year, measured at factor cost (NNP at FC). It is the principal indicator of economic performance and the basis for per capita income comparisons.

Conversion ladder (use top-to-bottom):

• GDP at MP = C + I + G + (X − M)
• NDP at MP = GDP at MP − Depreciation
• NDP at FC = NDP at MP − Net Indirect Taxes (NIT)
• NNP at FC = National Income = GNP at MP − Depreciation − NIT
• GNP at MP = GDP at MP + NFIA (Factor Income from abroad − to abroad)

Exam pointers:

• National Income = NNP at Factor Cost by convention — never NNP at MP.
• Real GDP = (Nominal GDP ÷ GDP Deflator) × 100; deflator uses base year = 100.
• Per Capita Income = National Income ÷ Mid-year Population (₹ per person).

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🟡 Standard — Regular Study (2d–2mo)

Standard content for students with a few days to months.

Definition and Scope

National Income aggregates the value of all final goods and services produced by residents of a country during an accounting year, valued at factor cost. The term “resident” is a legal-persons concept (citizens plus institutions ordinarily based in the country), not a geographic one — this is why a citizen working abroad still contributes to GNP but not to domestic GDP.

Three Methods of Measurement

The same National Income figure must be obtainable from three independent routes:

• Product/Output method — sum of value added at each production stage (Value of Output − Intermediate Consumption). Avoids double counting.
• Income method — sum of factor incomes: wages + rent + interest + profit + mixed income of self-employed.
• Expenditure method — C + I + G + (X − M); sum of final spending on the domestic product.

Gross vs Net and Market Price vs Factor Cost

Two perpendicular adjustments convert the basic measure:

Adjustment	What it does	Bridge formula
Gross → Net	Removes capital wear-and-tear	Net = Gross − Depreciation
MP → Factor Cost	Strips indirect taxes, adds subsidies	FC = MP − Net Indirect Taxes (NIT)

Common Pitfalls

• Transfer payments (pensions, scholarships) are not factor incomes and must be excluded from NI; they re-enter only when deriving Personal Income.
• Retained earnings of corporations are part of NI but not of PI; corporate tax + undistributed profits are stripped when moving from NI to PI.
• Intermediate goods cannot be summed in the Product method — only final goods or value added.

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🔴 Extended — Deep Study (3mo+)

Comprehensive coverage for students on a longer study timeline.

Circular Flow and Leakage-Injection Framework

The two-sector model has households and firms; leakages (savings) must equal injections (investment). Adding government introduces leakages (taxes) and injections (G); adding the foreign sector adds imports (leakage) and exports (injection). Equilibrium requires S + T + M = I + G + X, which algebraically reproduces the expenditure identity C + I + G + (X − M) = GDP at MP.

Real vs Nominal and the GDP Deflator

Nominal GDP rises with both output and prices, so year-on-year comparisons overstate growth during inflation. The GDP Deflator = (Nominal GDP ÷ Real GDP) × 100 is a Paasche-type index with the base year fixed at 100. Real GDP holds prices at base-year levels and isolates the volume change — the relevant figure for economic-growth analysis.

Worked Conversion Example

Suppose GDP at MP = ₹1,000, Depreciation = ₹80, Indirect Taxes = ₹100, Subsidies = ₹20, NFIA = ₹30.

• NDP at MP = 1,000 − 80 = ₹920
• NIT = 100 − 20 = ₹80
• NDP at FC = 920 − 80 = ₹840
• GNP at MP = 1,000 + 30 = ₹1,030
• NNP at FC = 1,030 − 80 − 80 = ₹870 ← National Income

Common Mistakes and Practice Prompts

• Confusing GDP with GNP and skipping the NFIA step.
• Adding NIT instead of subtracting it when moving MP → FC.

Practice prompts:

1. Given C = ₹500, I = ₹200, G = ₹150, X = ₹100, M = ₹80, Depreciation = ₹40, Indirect Taxes = ₹60, Subsidies = ₹20, NFIA = ₹10, compute National Income.
2. If Nominal GDP rises 12% and the deflator rises 8%, what is the real GDP growth rate?

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