10  National Income — Concept, Types and Measurement

10.1 What is National Income?

National income is the money value of all final goods and services produced by the residents of a country during an accounting year. It is the headline number for economic performance — the size of the cake the economy bakes in twelve months.

The UN Statistical Office’s System of National Accounts (SNA) is the international standard. India’s national-income statistics are compiled by the National Statistical Office (NSO) under the Ministry of Statistics and Programme Implementation (MoSPI). The base year used since 2015 is 2011-12; the next revision to 2022-23 base is under way.

TipWorking Definitions of National Income
Author / source Definition What it foregrounds
Alfred Marshall “The labour and capital of a country acting on its natural resources produce annually a certain net aggregate of commodities, material and immaterial, including services.” Production
A.C. Pigou “That part of the objective income of the community, including income derived from abroad, which can be measured in money.” Money-measurability
Irving Fisher “The national dividend or income consists solely of services received by ultimate consumers.” Consumer-services view
Simon Kuznets “The net output of commodities and services flowing during the year from the country’s productive system in the hands of ultimate consumers.” Final use
CSO / NSO India “The money value of all final goods and services produced by the normal residents of a country in a year, irrespective of where they reside.” Residency-based
NoteSimon Kuznets

Simon Kuznets developed the modern national-income framework for the US in the 1930s for the National Bureau of Economic Research. He won the 1971 Nobel Prize in Economics. He famously cautioned that “the welfare of a nation can scarcely be inferred from a measurement of national income” — a warning routinely ignored.

10.2 The Five Headline Aggregates

Five closely-related aggregates appear in every textbook. They differ on three axes — gross vs net, domestic vs national, and market price vs factor cost.

TipFive National-Income Aggregates
Aggregate Full name Formula
GDP Gross Domestic Product Money value of all final goods and services produced within geographical territory
GNP Gross National Product GDP + NFIA (Net Factor Income from Abroad)
NDP Net Domestic Product GDP − Depreciation
NNP Net National Product GNP − Depreciation = NDP + NFIA
NNP at factor cost = National Income NNP_FC NNP_MP − Indirect Taxes + Subsidies
TipThree pairs of distinctions
Pair Meaning
Gross vs Net Gross includes depreciation; Net excludes it. Net = Gross − Depreciation
Domestic vs National Domestic = produced inside the territory (by residents + non-residents). National = produced by residents (inside + abroad). National = Domestic + NFIA
Market Price vs Factor Cost Market Price includes indirect taxes and excludes subsidies. Factor Cost = MP − Indirect Tax + Subsidies 

flowchart LR
  GDPmp[GDP at Market Price] -->|+ NFIA| GNPmp[GNP at Market Price]
  GDPmp -->|- Depreciation| NDPmp[NDP at MP]
  GNPmp -->|- Depreciation| NNPmp[NNP at MP]
  NNPmp -->|- Indirect Tax<br/>+ Subsidies| NI[NNP at Factor Cost<br/>= National Income]
    classDef default fill:#003366,color:#ffffff,stroke:#ffcc00,stroke-width:3px,rx:10px,ry:10px;

NoteNFIA = Net Factor Income from Abroad

NFIA = Factor income earned by residents from abroad − Factor income earned by non-residents inside the country. Includes wages, interest, profits, rent. For India NFIA is negative — Indians earn less from foreign factors than foreigners earn from Indian factors (mostly capital).

If NFIA > 0 → GNP > GDP. If NFIA < 0 → GNP < GDP (the typical Indian case).

10.3 Other Important Concepts

TipRelated concepts
Concept Formula
Personal Income (PI) NI − Undistributed corporate profit − Corporate tax − Social security contributions + Transfer payments
Disposable Personal Income (DPI) PI − Personal direct tax
Per Capita Income (PCI) National Income ÷ Population
Per Capita NDP NDP ÷ Population
Real National Income Nominal NI / GDP Deflator × 100
GDP Deflator (Nominal GDP / Real GDP) × 100
Real GDP growth % change in Real GDP

10.3.1 Nominal vs Real

  • Nominal GDP uses current prices.
  • Real GDP uses base-year (constant) prices — strips out price changes.

The GDP deflator is a broader inflation index than CPI/WPI because it covers every good and service in the GDP basket.

10.4 Three Methods of Measuring National Income

The same flow of activity can be summed three ways — they should be equal by definition.

TipThree methods at a glance
Method What is added up Caution
Product / Output / Value-added method Value added at each stage of production Avoid double counting — use value added (not total sales)
Income method Wages + Rent + Interest + Profit + Mixed income (W+R+I+P+M) Exclude transfer incomes (pensions, gifts)
Expenditure method C + I + G + (X − M) Exclude second-hand sales and intermediate purchases

10.4.1 Product (Output) Method

Sum of value added at every stage of production. Each sector reports its gross value of output minus intermediate consumption = gross value added (GVA). Aggregating all sectors gives GVA at basic prices; adding product taxes minus product subsidies gives GDP at market price.

Three-stage example. Farmer produces wheat ₹100 → Miller buys wheat at ₹100, sells flour at ₹160 (value added = ₹60) → Baker buys flour at ₹160, sells bread at ₹240 (value added = ₹80). Total GVA = 100 + 60 + 80 = ₹240 (equal to final consumer price of bread). Adding the sale of wheat (₹100) + flour (₹160) + bread (₹240) = ₹500 would triple-count.

NoteGVA vs GDP — the 2015 shift

Since the 2015 revision, India’s main supply-side aggregate is GVA at basic prices rather than GDP at factor cost. The relationship is:

GDP at market price = GVA at basic prices + Product taxes − Product subsidies.

10.4.2 Income Method

Sum of factor incomes earned in the production of the year’s GDP: W + R + I + P + Mixed, where:

  • W = Compensation of employees (wages + salaries + employer contribution to social security).
  • R = Rent (and royalty).
  • I = Interest.
  • P = Profits (distributed dividends + corporate tax + undistributed profits).
  • Mixed income = Income of self-employed (farmer, small trader) where wages/rent/profit cannot be cleanly separated.

The sum gives Net Domestic Income at factor cost — i.e., NDP at FC. Adding depreciation gives GDP at FC; adding NFIA gives National Income.

10.4.3 Expenditure Method

Sum of expenditures on the year’s final output:

\[\text{GDP at MP} = C + I + G + (X - M)\]

Where:

  • C = Private final consumption expenditure (PFCE).
  • I = Gross capital formation = Fixed investment + Change in stocks.
  • G = Government final consumption expenditure.
  • (X − M) = Net exports.

10.4.4 Reconciliation — the identity

By definition, Output ≡ Income ≡ Expenditure (the three-fold identity of national income accounting).

10.5 Difficulties in Measurement

TipDifficulties in measuring national income
  • Non-monetised sector — subsistence farming, household services (cooking, child-rearing) are not counted.
  • Underground / informal economy — estimated at 20–30 % of Indian GDP; goes uncounted.
  • Double counting — risk if intermediate goods are added.
  • Transfer payments — pensions, scholarships, gifts must be excluded (no production behind them).
  • Capital gains — value-change on assets is not production.
  • Inventory valuation — change in stocks must be valued consistently.
  • Black money / tax evasion — under-reporting.
  • Environmental degradation — depletion of natural capital is not netted out (a major critique of GDP).

10.6 Limitations of National Income as a Welfare Indicator

TipWhy GDP ≠ welfare
  • Distribution ignored — a country with one billionaire and 99 paupers has the same GDP as one with 100 middle-class citizens.
  • Composition ignored — defence spending counts equally with health spending.
  • Quality of life — leisure, environment, longevity are missed.
  • Externalities — pollution costs are not netted.
  • Non-market activities — household production excluded.
  • Subjective well-being — beyond money measurement.
NoteAlternative welfare measures
  • Human Development Index (HDI) — UNDP, Mahbub ul Haq and Amartya Sen, 1990. Three dimensions: Life expectancy · Education · Income (log GNI per capita PPP).
  • Genuine Progress Indicator (GPI).
  • Gross National Happiness (GNH) — Bhutan.
  • OECD Better Life Index.
  • Stiglitz-Sen-Fitoussi Commission report (2009) on the measurement of economic performance and social progress.

10.7 India’s National Income — Institutional Set-up

TipIndia — national income timeline
  • 1868 — Dadabhai Naoroji, Poverty and Un-British Rule in India. First Indian national-income estimate.
  • 1925 — V.K.R.V. Rao’s pioneering scientific estimate.
  • 1949 — National Income Committee set up under P.C. Mahalanobis (with D.R. Gadgil and V.K.R.V. Rao) — first official estimates.
  • 1955 — Central Statistical Organisation (CSO) set up to publish official national income.
  • 2014 — CSO begins publishing GDP at market price (instead of GDP at factor cost) — base year 2011-12.
  • 2019 — MoSPI restructures as National Statistical Office (NSO).

10.7.1 Sector classification

TipEight industry sectors used in India’s GVA
  • Primary: Agriculture, forestry & fishing; Mining & quarrying.
  • Secondary: Manufacturing; Construction; Electricity, gas, water supply & other utility services.
  • Tertiary (Services): Trade, hotels, transport, communication & broadcasting; Financial, real estate & professional services; Public administration, defence & other services.

Approximate sectoral shares in India today: Primary ~17 %, Secondary ~26 %, Services ~57 %. Services share has been rising for decades.

10.8 Circular Flow of Income

flowchart LR
  H[Households<br/>own factors] -->|Factor services| F[Firms]
  F -->|Factor income<br/>W + R + I + P| H
  H -->|Consumption expenditure| F
  F -->|Goods & services| H
    classDef default fill:#003366,color:#ffffff,stroke:#ffcc00,stroke-width:3px,rx:10px,ry:10px;

The simplest two-sector model (households + firms) is extended by:

  • Three-sector = adds Government (taxes, transfers, public spending).
  • Four-sector = adds Rest of the World (exports, imports, foreign factor incomes).

10.8.1 Injections and Withdrawals

TipInjections vs Withdrawals
Injections (add to flow) Withdrawals (leak out)
Investment (I) Saving (S)
Government spending (G) Taxes (T)
Exports (X) Imports (M)

In equilibrium, I + G + X = S + T + M.

10.9 Practice Questions

Q 01 GDP vs GNP Easy

GNP is equal to:

  • AGDP − Depreciation
  • BGDP + NFIA
  • CGDP − Indirect taxes
  • DGDP + Indirect taxes
View solution
Correct Option: B
GNP = GDP + NFIA. Net Factor Income from Abroad turns *domestic* into *national*.
Q 02 National Income Medium

In Indian national-income statistics, "National Income" is most precisely:

  • AGDP at Market Price
  • BGDP at Factor Cost
  • CNNP at Factor Cost
  • DNDP at Market Price
View solution
Correct Option: C
National Income = NNP at Factor Cost: NDP at FC + NFIA, or NNP at MP minus net indirect taxes.
Q 03 Domestic vs National Medium

An Indian software engineer working in California sends home remittances. In which aggregate does her income appear?

  • AIndia's GDP
  • BIndia's GNP
  • CUSA's GNP
  • DNeither India's nor USA's national accounts
View solution
Correct Option: B
She is an Indian *national* working abroad → her factor income enters India's GNP (via NFIA) and the USA's *GDP*.
Q 04 Three Methods Medium

Which is *not* one of the three methods of measuring national income?

  • AProduct / Value-added
  • BIncome
  • CExpenditure
  • DInventory
View solution
Correct Option: D
The three are Product (value added), Income (W+R+I+P+M), and Expenditure (C+I+G+(X−M)). Inventory is a *concept*, not a method.
Q 05 Expenditure Method Medium

In the expenditure method, GDP at market price equals:

  • AC + I + G + X − M
  • BW + R + I + P + M
  • CSum of value added at each stage
  • DPI − Direct tax
View solution
Correct Option: A
C + I + G + (X − M) is the expenditure-method equation. B is income method; C is product method; D is disposable income.
Q 06 Double Counting Medium

The chief problem the value-added (product) method is designed to avoid is:

  • AInflation
  • BDouble counting
  • CTax evasion
  • DCapital depreciation
View solution
Correct Option: B
Adding *total* output of all stages would double-count intermediate goods. The value-added method (output at each stage − inputs from previous stage) eliminates this.
Q 07 Transfer Payments Medium

Why is an old-age pension *not* included in National Income?

  • AIt is a transfer payment without current production behind it
  • BIt is too small to matter
  • CIt is taxed separately
  • DIt is paid by employers
View solution
Correct Option: A
Transfer payments (pensions, scholarships, gifts) are excluded because they are not payment for current production. They redistribute existing income.
Q 08 Disposable Income Easy

Disposable Personal Income (DPI) is best defined as:

  • ANational Income − Indirect taxes
  • BPersonal Income − Personal Direct tax
  • CGDP − Corporate tax
  • DGNP − Depreciation
View solution
Correct Option: B
DPI = PI − Personal Direct Tax. It is what households actually have to spend or save.
Q 09 Real vs Nominal Medium

The GDP deflator is calculated as:

  • A(Real GDP / Nominal GDP) × 100
  • B(Nominal GDP / Real GDP) × 100
  • CCPI − WPI
  • DNominal GDP − Real GDP
View solution
Correct Option: B
GDP deflator = (Nominal GDP / Real GDP) × 100. It is a broad price index covering every good in GDP — wider than CPI or WPI.
Q 10 Kuznets Easy

The economist who developed the modern national-income framework and won the 1971 Nobel Prize is:

  • ASimon Kuznets
  • BA.C. Pigou
  • CJ.M. Keynes
  • DPaul Samuelson
View solution
Correct Option: A
Simon Kuznets built the US national-income accounts for the NBER; Nobel 1971.
Q 11 India NI Medium

India's first official national-income estimates were prepared in 1949–50 by the National Income Committee chaired by:

  • ADadabhai Naoroji
  • BP.C. Mahalanobis
  • CV.K.R.V. Rao
  • DD.R. Gadgil
View solution
Correct Option: B
The 1949 National Income Committee was chaired by P.C. Mahalanobis, with V.K.R.V. Rao and D.R. Gadgil as members. Naoroji made the earliest unofficial estimate (1868).
Q 12 Base Year Medium

The current base year for India's GDP series (since 2015) is:

  • A2004-05
  • B2011-12
  • C1999-2000
  • D2017-18
View solution
Correct Option: B
The CSO switched to 2011-12 as base year in January 2015, along with the move to GDP at market price and GVA at basic prices.
Q 13 Sector Share Medium

In India's GVA composition today, the largest share is from:

  • AAgriculture, forestry & fishing
  • BManufacturing
  • CServices (tertiary)
  • DMining
View solution
Correct Option: C
Services (tertiary) contribute the largest share (~57 %), Primary ~17 %, Secondary ~26 %.
Q 14 Welfare Medium

The Human Development Index (HDI), launched by UNDP in 1990, combines:

  • AIncome, Education, Life expectancy
  • BIncome, Inflation, Unemployment
  • CIncome, Health, Environment
  • DIncome, Population, Poverty
View solution
Correct Option: A
HDI (Mahbub ul Haq + Amartya Sen, 1990): geometric mean of Life expectancy · Education (mean & expected years of schooling) · Income (log GNI per capita PPP).
Q 15 India agency Easy

India's official national-income statistics are now published by:

  • ARBI
  • BNITI Aayog
  • CNSO under MoSPI
  • DMinistry of Finance
View solution
Correct Option: C
National Statistical Office (NSO) under the Ministry of Statistics and Programme Implementation (MoSPI) — restructured from the older CSO in 2019.
Q 16 Circular flow Medium

In a four-sector circular flow of income, the four sectors are:

  • AHouseholds, Firms, Government, Rest of the World
  • BHouseholds, Firms, Banks, Government
  • CAgriculture, Industry, Services, Government
  • DProducers, Consumers, Workers, Savers
View solution
Correct Option: A
Four sectors = Households + Firms + Government + Rest of the World. Two-sector adds nothing else; three-sector adds Government; four-sector adds the foreign sector.
Q 17 Identity Hard

In macroeconomic equilibrium for a four-sector economy:

  • AS = I only
  • BI + G + X = S + T + M
  • CC = Y
  • DG = T
View solution
Correct Option: B
In equilibrium, total injections (I + G + X) = total withdrawals (S + T + M).
Q 18 MP–FC Medium

GDP at Factor Cost equals GDP at Market Price:

  • APlus indirect taxes plus subsidies
  • BMinus indirect taxes plus subsidies
  • CMinus depreciation
  • DPlus NFIA
View solution
Correct Option: B
FC = MP − Indirect Taxes + Subsidies. Indirect taxes inflate market price above the cost paid to factors; subsidies pull it below.
Q 19 Naoroji Hard

The earliest estimate of India's national income, in *Poverty and Un-British Rule in India* (1868), is by:

  • AV.K.R.V. Rao
  • BP.C. Mahalanobis
  • CDadabhai Naoroji
  • DB.R. Ambedkar
View solution
Correct Option: C
Dadabhai Naoroji made the first Indian per-capita income estimate (₹20 p.a.) in 1868. V.K.R.V. Rao improved the methodology in 1925.
Q 20 Match Concepts Hard

Match the aggregate with the formula:

(i) NDP at MP (a) GNP − Depreciation
(ii) NNP at MP (b) PI − Personal Tax
(iii) National Income (c) GDP − Depreciation
(iv) Disposable Income (d) NNP at MP − Indirect Tax + Subsidies
  • A(i)-(c), (ii)-(a), (iii)-(d), (iv)-(b)
  • B(i)-(a), (ii)-(b), (iii)-(c), (iv)-(d)
  • C(i)-(b), (ii)-(d), (iii)-(c), (iv)-(a)
  • D(i)-(d), (ii)-(c), (iii)-(b), (iv)-(a)
View solution
Correct Option: A
NDP@MP = GDP − Depreciation; NNP@MP = GNP − Depreciation; National Income = NNP@MP − Indirect Tax + Subsidies; DPI = PI − Personal Tax.

10.9.1 Advanced Format Questions

AR 1Assertion-ReasonHard

A: GDP measures final goods and services within domestic boundary.
R: Intermediate goods are excluded to avoid double counting.

  • ABoth true; R explains A
  • BBoth true; R does not explain A
  • CA true, R false
  • DA false, R true
View solution
Correct Option: A
AR 2Assertion-ReasonMedium

A: GNP equals GDP plus net factor income from abroad.
R: India's NFIA is typically negative due to investment income outflows.

  • ABoth true; R explains A
  • BBoth true; R does not explain A
  • CA true, R false
  • DA false, R true
View solution
Correct Option: B
S 1Statement-basedMedium

Methods of NI measurement: (i) Product. (ii) Income. (iii) Expenditure. (iv) Value-added.

  • AAll four are recognised methods
  • B(i), (ii), (iii) only
  • C(ii) and (iii) only
  • D(i) and (iv) only
View solution
Correct Option: A
N 1NumericalMedium

If Nominal GDP = ₹200 lakh Cr and GDP deflator = 125, Real GDP is:

  • A₹160 lakh Cr
  • B₹250 lakh Cr
  • C₹200 lakh Cr
  • D₹75 lakh Cr
View solution
Correct Option: A
Real = Nominal/(Deflator/100) = 200/1.25 = 160.

10.10 Quick Recall

ImportantQuick recall
  • Definitions — Marshall (production), Pigou (money-measurability), Fisher (consumer-services), Kuznets (final use; Nobel 1971).
  • Five aggregates on three axes (Gross/Net · Domestic/National · MP/FC). GNP = GDP + NFIA; NNP = GNP − Depreciation; NI = NNP at FC; FC = MP − Indirect Tax + Subsidies.
  • Three measurement methods: Product/Value-added · Income (W+R+I+P+Mixed) · Expenditure (C + I + G + X − M). All three are equal by identity.
  • Personal Income = NI − retained profits − corp tax − SS contribution + transfers. DPI = PI − Personal Direct Tax.
  • GDP deflator = (Nominal / Real) × 100. Broader than CPI / WPI.
  • Exclude from NI: transfer payments, second-hand sales, capital gains, intermediate goods, illegal income (officially).
  • India institutional set-up: Naoroji 1868 (first estimate) → V.K.R.V. Rao 1925 → Mahalanobis 1949 NI Committee → CSO 1955 → base year 2011-12 (since 2015) → NSO/MoSPI (2019). Sectoral shares ~ Primary 17 %, Secondary 26 %, Services 57 %.
  • Alternative welfare measures: HDI (UNDP 1990 — Mahbub ul Haq & Amartya Sen) · GPI · GNH (Bhutan) · OECD Better Life · Stiglitz-Sen-Fitoussi (2009).
  • Circular flow equilibrium: I + G + X = S + T + M in four-sector economy.