NCERT Solutions for Class 12 Economics Chapter 2: National Income Accounting

These Class 12 Economics Chapter 2 solutions cover National Income Accounting from the NCERT textbook Introductory Macroeconomics, updated for the 2026–27 session. You get the complete end-of-chapter Exercises reproduced verbatim and answered in full, with every GDP, GNP, NNP, value-added, deficit and deflator numerical worked step by step and verified. The chapter introduces final and intermediate goods, stocks and flows, the three methods of measuring national income (product/value-added, expenditure and income), the family of income aggregates (GDP, GNP, NNP at market price and factor cost, NI, PI, PDI), and the price indices (GDP deflator, CPI, WPI). Below you also get key formulas, extra practice, MCQs, Assertion–Reason and FAQs.

Class: 12 Subject: Economics Book: Introductory Macroeconomics Chapter: 2 Topic: National Income Accounting Session: 2026–27
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Class 12 Economics Chapter 2 – Overview

Chapter 2, National Income Accounting, builds the language of macroeconomics. It begins by distinguishing final goods (consumption goods and capital goods) from intermediate goods, and explains why only final goods are counted to avoid double counting. It introduces stocks (defined at a point of time, e.g. capital) and flows (defined over a period, e.g. income, investment, depreciation), and shows that net investment = gross investment − depreciation. Using the simple firms–households circular flow, the chapter derives the three identical ways of computing GDP — the product/value-added method, the expenditure method (C + I + G + X − M) and the income method (W + P + In + R). It then defines the full set of aggregates — GDP, GNP, NNP at market price and factor cost, National Income, Personal Income and Personal Disposable Income — and the price indices (GDP deflator, CPI, WPI). It closes by arguing that GDP is an imperfect index of welfare because of unequal distribution, non-monetary exchanges and externalities.

Key Concepts & Terms

Final goods: goods meant for final use that do not pass through any further stage of production — either consumption goods (food, clothing, recreation; including consumer durables) or capital goods (tools, machines, buildings used in production).

Intermediate goods: goods used up as raw material or inputs in producing other goods within the year (e.g. steel sheets for cars). They are excluded from national income to avoid double counting.

Stocks vs flows: a stock is measured at a point of time (capital, inventory, water in a tank); a flow is measured over a period of time (income, investment, depreciation, change in inventory, water flowing in per minute).

Gross & net investment: gross investment is the output of capital goods; Net investment = Gross investment − Depreciation. Depreciation (consumption of fixed capital) is the annual allowance for wear and tear of capital.

Value added: the net contribution of a firm = value of its output − value of intermediate goods used. Gross Value Added (GVA) includes depreciation; Net Value Added (NVA) = GVA − depreciation.

Inventory: the stock of unsold finished goods, semi-finished goods or raw materials carried from one year to the next. Change in inventory ≡ production − sales, and is treated as investment (planned or unplanned).

Net Factor Income from Abroad (NFIA): factor income earned by domestic factors abroad − factor income earned by foreign factors in the domestic economy. GNP = GDP + NFIA.

Net indirect taxes (NIT): Indirect taxes − Subsidies. Market price = Factor cost + NIT, so Factor cost = Market price − NIT.

Nominal vs Real GDP: nominal GDP values output at current prices; real GDP values it at constant base-year prices, so a change in real GDP reflects a change in the volume of output.

Price indices: GDP deflator = (Nominal GDP / Real GDP) × 100; CPI measures the cost of a fixed consumer basket relative to the base year; WPI (PPI in the USA) tracks wholesale prices.

Limitations of GDP as welfare: distribution of GDP may be unequal, non-monetary (barter, unpaid domestic work) exchanges are missed, and externalities (pollution, etc.) are ignored.

Important Formulas (Chapter 2)

Three methods of GDP: GDP ≡ ΣGVAi ≡ C + I + G + X − M ≡ W + P + In + R.

Value added: Value Added = Value of output − Intermediate consumption; NVA = GVA − Depreciation.

Net investment: Net Investment = Gross Investment − Depreciation.

GNP: GNP = GDP + NFIA  •  NNP: NNPMP = GNPMP − Depreciation.

National Income: NNPFC = NI = NNPMP − Net Indirect Taxes (Indirect taxes − Subsidies).

Personal Income: PI = NI − Undistributed Profits − Net interest paid by households − Corporate tax + Transfer payments to households.

Personal Disposable Income: PDI = PI − Personal tax payments − Non-tax payments.

National accounting identity: Trade deficit (X − M) = (S − I) + (T − G).

GDP deflator: GDP deflator = (Nominal GDP / Real GDP) × 100  •  CPI = (Cost of basket in current year / Cost of basket in base year) × 100.

NCERT “Exercises” — Full Solutions

All questions below are reproduced verbatim from the NCERT textbook’s end-of-chapter Exercises. Answers are original; numericals are worked step by step and verified.

1. What are the four factors of production and what are the remunerations to each of these called?

ANSWER The four factors of production and their respective remunerations are: 1. Land (fixed natural resources) — remuneration is Rent. 2. Labour (human effort) — remuneration is Wage (wages and salaries). 3. Capital — remuneration is Interest. 4. Entrepreneurship (organising and risk-taking) — remuneration is Profit.

2. Why should the aggregate final expenditure of an economy be equal to the aggregate factor payments? Explain.

ANSWER In the circular flow of income, the firms produce goods and services and sell them, earning sales revenue. This revenue, after deducting the value of intermediate goods, is the value added of the firms. The entire value added of the firms is distributed among the four factors of production as rent, wages, interest and profit — i.e. as factor payments. Nothing is left over, because profit itself is a residual paid to the entrepreneur. Therefore the aggregate final expenditure (spending received by firms on final goods) equals the aggregate value added, which in turn equals the aggregate factor payments. The same money moves in a circle: final expenditure ≡ value of output ≡ factor incomes. This is why the expenditure method and the income method give the same GDP.

3. Distinguish between stock and flow. Between net investment and capital which is a stock and which is a flow? Compare net investment and capital with flow of water into a tank.

ANSWER Stock vs flow: A stock is a quantity measured at a particular point of time and has no time dimension (e.g. capital, wealth, money supply, inventory). A flow is a quantity measured over a period of time and has a time dimension (e.g. income, output, investment, depreciation). Capital is a stock — it is the amount of machines, buildings, etc., existing at a point of time. Net investment is a flow — it is the addition made to the capital stock over a period of time. Water-tank analogy: the water already present in the tank at a given moment is a stock, just like capital. The water flowing into the tank through the tap per minute is a flow, just like net investment, which adds to the existing capital stock over time.

4. What is the difference between planned and unplanned inventory accumulation? Write down the relation between change in inventories and value added of a firm.

ANSWER Planned inventory accumulation occurs when a firm deliberately raises (or lowers) its stock of goods as intended — e.g. producing extra to raise inventories from 100 to 200 shirts as planned. It is anticipated. Unplanned inventory accumulation occurs due to unexpected changes in sales. If sales fall short of expectation, the firm is left with unsold goods — an unplanned accumulation; if sales unexpectedly exceed expectation, inventories fall — an unplanned decumulation. Relation with value added: Since production ≡ value added + intermediate goods used, and change in inventories ≡ production − sales, Change in inventories of a firm during a year ≡ Value added + Intermediate goods used by the firm − Sales of the firm during the year.

5. Write down the three identities of calculating the GDP of a country by the three methods. Also briefly explain why each of these should give us the same value of GDP.

ANSWER The three identities for GDP are: (i) Product / Value-added method: GDP ≡ Σi GVAi (sum of gross value added of all firms). (ii) Expenditure method: GDP ≡ C + I + G + X − M. (iii) Income method: GDP ≡ W + P + In + R (wages + profit + interest + rent). Why they are equal: The value of output produced (product method) is sold and so equals the total spending on it (expenditure method). The sales revenue received by firms, after netting out intermediate purchases, is wholly paid out to the factors of production as rent, wages, interest and profit (income method). The same aggregate of money moves in a circle through the goods market and the factor market, so measuring it at any of the three points — production, expenditure or income — gives the same value of GDP.

6. Define budget deficit and trade deficit. The excess of private investment over saving of a country in a particular year was Rs 2,000 crores. The amount of budget deficit was (–) Rs 1,500 crores. What was the volume of trade deficit of that country?

ANSWER Budget deficit is the excess of total government expenditure over total government revenue in a year, i.e. (G − T). Trade deficit is the excess of a country’s imports over its exports of goods and services, i.e. (M − X), or equivalently a negative value of net exports (X − M). Given: Excess of private investment over saving = I − S = Rs 2,000 crores, so (S − I) = − Rs 2,000 crores. Budget deficit (G − T) = (−) Rs 1,500 crores, so (T − G) = + Rs 1,500 crores. Identity used: Net exports (X − M) = (S − I) + (T − G). Working: X − M = (−2,000) + (1,500) = − Rs 500 crores. Since net exports are negative, imports exceed exports. Trade deficit (M − X) = Rs 500 crores.

7. Suppose the GDP at market price of a country in a particular year was Rs 1,100 crores. Net Factor Income from Abroad was Rs 100 crores. The value of Indirect taxes – Subsidies was Rs 150 crores and National Income was Rs 850 crores. Calculate the aggregate value of depreciation.

ANSWER Given: GDPMP = Rs 1,100 cr; NFIA = Rs 100 cr; Net Indirect Taxes (IT − Sub) = Rs 150 cr; National Income (NNPFC) = Rs 850 cr. Step 1 — GNP at MP: GNPMP = GDPMP + NFIA = 1,100 + 100 = Rs 1,200 cr. Step 2 — relation to National Income: National Income = GNPMP − Depreciation − Net Indirect Taxes. Step 3 — solve for depreciation: 850 = 1,200 − Depreciation − 150. Depreciation = 1,200 − 150 − 850 = Rs 200 crores.

8. Net National Product at Factor Cost of a particular country in a year is Rs 1,900 crores. There are no interest payments made by the households to the firms/government, or by the firms/government to the households. The Personal Disposable Income of the households is Rs 1,200 crores. The personal income taxes paid by them is Rs 600 crores and the value of retained earnings of the firms and government is valued at Rs 200 crores. What is the value of transfer payments made by the government and firms to the households?

ANSWER Given: NNPFC (National Income) = Rs 1,900 cr; Net interest payments by households = 0; PDI = Rs 1,200 cr; Personal income taxes = Rs 600 cr; Retained earnings / Undistributed profits = Rs 200 cr. Step 1 — recover Personal Income from PDI: PDI = PI − Personal tax payments ⇒ PI = PDI + Personal taxes = 1,200 + 600 = Rs 1,800 cr. Step 2 — use the PI identity: PI = NI − Undistributed profits − Net interest paid by households + Transfer payments. 1,800 = 1,900 − 200 − 0 + Transfer payments. Step 3 — solve: Transfer payments = 1,800 − (1,900 − 200) = 1,800 − 1,700 = Rs 100 crores.

9. From the following data, calculate Personal Income and Personal Disposable Income.

ItemRs (crore)
(a)Net Domestic Product at factor cost8,000
(b)Net Factor Income from abroad200
(c)Undisbursed Profit1,000
(d)Corporate Tax500
(e)Interest Received by Households1,500
(f)Interest Paid by Households1,200
(g)Transfer Income300
(h)Personal Tax500
ANSWER Step 1 — National Income (NNPFC): NI = NDPFC + NFIA = 8,000 + 200 = Rs 8,200 cr. Step 2 — Personal Income: PI = NI − Undistributed (undisbursed) profit − Corporate tax − Net interest paid by households + Transfer income. Net interest paid by households = Interest paid − Interest received = 1,200 − 1,500 = − Rs 300 cr (households are net receivers of interest, so this adds Rs 300 cr). PI = 8,200 − 1,000 − 500 − (−300) + 300 = 8,200 − 1,000 − 500 + 300 + 300 = Rs 7,300 crores. Step 3 — Personal Disposable Income: PDI = PI − Personal tax = 7,300 − 500 = Rs 6,800 crores.

10. In a single day Raju, the barber, collects Rs 500 from haircuts; over this day, his equipment depreciates in value by Rs 50. Of the remaining Rs 450, Raju pays sales tax worth Rs 30, takes home Rs 200 and retains Rs 220 for improvement and buying of new equipment. He further pays Rs 20 as income tax from his income. Based on this information, complete Raju’s contribution to the following measures of income (a) Gross Domestic Product (b) NNP at market price (c) NNP at factor cost (d) Personal income (e) Personal disposable income.

ANSWER (a) Gross Domestic Product = value of the service produced = total collection from haircuts = Rs 500. (b) NNP at market price = GDP − Depreciation (no NFIA for a single producer) = 500 − 50 = Rs 450. (c) NNP at factor cost = NNPMP − Net Indirect Taxes (here the sales tax) = 450 − 30 = Rs 420. (d) Personal income = NNPFC − Retained earnings (the Rs 220 kept for new equipment is not paid out as personal income) = 420 − 220 = Rs 200. (This matches the Rs 200 Raju takes home.) (e) Personal disposable income = Personal income − Income tax = 200 − 20 = Rs 180.

11. The value of the nominal GNP of an economy was Rs 2,500 crores in a particular year. The value of GNP of that country during the same year, evaluated at the prices of same base year, was Rs 3,000 crores. Calculate the value of the GNP deflator of the year in percentage terms. Has the price level risen between the base year and the year under consideration?

ANSWER Given: Nominal GNP = Rs 2,500 cr; Real GNP (at base-year prices) = Rs 3,000 cr. Formula: GNP deflator = (Nominal GNP / Real GNP) × 100. Working: GNP deflator = (2,500 / 3,000) × 100 = 83.33% (approximately). Conclusion: Since the deflator is less than 100, the price level has not risen — in fact it has fallen between the base year and the current year (current-year prices are lower than base-year prices).

12. Write down some of the limitations of using GDP as an index of welfare of a country.

ANSWER GDP (even real GDP) is an imperfect index of welfare for at least three reasons: 1. Distribution of GDP: A rise in GDP may be concentrated in a few hands while the majority become worse off, so a higher GDP need not mean greater welfare for the people as a whole. 2. Non-monetary exchanges: Many useful activities — unpaid domestic services and barter exchanges in the informal sector — are not valued in money and are left out of GDP, leading to underestimation of welfare. 3. Externalities: GDP ignores externalities. Negative externalities such as pollution from a factory harm people without being deducted, so GDP overestimates welfare; positive externalities are also missed, so GDP can underestimate welfare too.

Extra Practice Questions

Short Answer Type Questions

Q1. Distinguish between final goods and intermediate goods.

ANSWERFinal goods are meant for final use (consumption or investment) and do not undergo any further transformation in production — e.g. bread bought by a household. Intermediate goods are used up as inputs in producing other goods within the year — e.g. flour bought by a bakery. Whether a good is final or intermediate depends not on its nature but on the economic use to which it is put.

Q2. Why are only final goods included while calculating national income?

ANSWEROnly final goods are counted to avoid the error of double counting. The value of a final good already includes the value of all the intermediate goods used in producing it. Counting intermediate goods separately would count the same value more than once and exaggerate national income.

Q3. Calculate the value added by a firm if its value of output is Rs 100, intermediate consumption is Rs 20 and depreciation is Rs 10.

ANSWERGross Value Added = Output − Intermediate consumption = 100 − 20 = Rs 80. Net Value Added = GVA − Depreciation = 80 − 10 = Rs 70. So GVA = Rs 80 and NVA = Rs 70.

Q4. State whether the following are stocks or flows: (i) capital (ii) income (iii) inventory (iv) depreciation.

ANSWER(i) Capital — stock (measured at a point of time); (ii) Income — flow (over a period); (iii) Inventory — stock (measured at a point of time); (iv) Depreciation — flow (annual allowance over a period). Change in inventory, however, is a flow.

Q5. Distinguish between nominal GDP and real GDP.

ANSWERNominal GDP values output at current-year prices, so it changes when either output or prices change. Real GDP values output at constant base-year prices, so it changes only when the volume of output changes. Real GDP is therefore the better measure for comparing production across years or countries.

Long Answer Type Questions

Q1. Explain the value-added (product) method of calculating GDP with an example, and show how it avoids double counting.

ANSWERIn the product or value-added method, GDP is the sum of the gross value added of all firms, where value added = value of output − value of intermediate goods used. This avoids double counting because the value of intermediate goods is deducted at each stage. Consider a farmer who grows Rs 100 of wheat using no inputs, and sells Rs 50 of it to a baker who turns it into Rs 200 of bread. Simply adding outputs (100 + 200 = Rs 300) double-counts the Rs 50 of wheat. The correct figure is the sum of value added: farmer’s value added = 100 − 0 = Rs 100, baker’s value added = 200 − 50 = Rs 150, so GDP = 100 + 150 = Rs 250. By netting out intermediate consumption, the method counts only the new value created at each stage.

Q2. Explain the relationship between GDP, GNP, NNP at market price, and National Income (NNP at factor cost).

ANSWERGDP at market price measures the value of final goods and services produced within the domestic territory. Adding Net Factor Income from Abroad (NFIA) converts the domestic concept into the national concept: GNPMP = GDPMP + NFIA. Deducting depreciation (consumption of fixed capital) gives the net measure: NNPMP = GNPMP − Depreciation. Finally, market price includes net indirect taxes (indirect taxes − subsidies), which accrue to the government rather than to factors of production. Deducting them gives the income that actually accrues to factors: National Income = NNPFC = NNPMP − Net indirect taxes. Thus moving from GDP to NI involves three adjustments — adding NFIA, subtracting depreciation, and subtracting net indirect taxes.

Q3. “GDP is not a satisfactory measure of economic welfare.” Discuss.

ANSWERAlthough a higher real GDP usually allows people to buy more goods and services, GDP fails as a welfare index for several reasons. First, the distribution may be unequal: if the rise in GDP is captured by a few while most people earn less, welfare may fall even as GDP rises. Second, non-monetary exchanges such as unpaid domestic work and barter in the informal sector are excluded, so GDP underestimates the true level of activity, especially in developing countries. Third, GDP ignores externalities: a factory’s pollution lowers others’ welfare without being deducted, so GDP overstates welfare, while positive externalities are missed, causing understatement. In addition, GDP says nothing about leisure, health, the environment or the composition of output (e.g. more weapons vs more education). Hence GDP must be supplemented by other indicators when judging welfare.

MCQs & Assertion–Reason

1. Which of the following is an intermediate good?

(a) A car bought by a household    (b) Flour bought by a bakery to make bread    (c) A machine bought by a firm    (d) Bread bought by a consumer

2. Net investment is equal to:

(a) Gross investment + Depreciation    (b) Gross investment − Depreciation    (c) Depreciation − Gross investment    (d) Gross investment × Depreciation

3. Which of the following is a stock variable?

(a) Income    (b) Investment    (c) Capital    (d) Depreciation

4. GDP by the expenditure method equals:

(a) W + P + In + R    (b) C + I + G + X − M    (c) ΣGVA − Depreciation    (d) GDP + NFIA

5. GNP is obtained from GDP by:

(a) Subtracting depreciation    (b) Adding net factor income from abroad    (c) Subtracting net indirect taxes    (d) Adding subsidies

6. National Income is the same as:

(a) NNP at market price    (b) GNP at market price    (c) NNP at factor cost    (d) Gross Domestic Product

7. Market price = Factor cost +

(a) Net factor income from abroad    (b) Depreciation    (c) Net indirect taxes    (d) Subsidies

8. The GDP deflator is the ratio of:

(a) Real GDP to Nominal GDP    (b) Nominal GDP to Real GDP    (c) GDP to GNP    (d) CPI to WPI

9. Change in inventories of a firm during a year is treated as:

(a) Intermediate consumption    (b) Depreciation    (c) Investment    (d) Government expenditure

10. Which of the following is NOT a limitation of GDP as an index of welfare?

(a) Unequal distribution of GDP    (b) Non-monetary exchanges    (c) Externalities    (d) Use of constant base-year prices

Answer key: 1-(b), 2-(b), 3-(c), 4-(b), 5-(b), 6-(c), 7-(c), 8-(b), 9-(c), 10-(d).

For each Assertion–Reason question, choose: (A) Both true and the Reason correctly explains the Assertion; (B) Both true but the Reason is not the correct explanation; (C) Assertion true, Reason false; (D) Assertion false, Reason true.

A-R 1. Assertion: Intermediate goods are excluded while calculating national income.

Reason: Including them would lead to the error of double counting.

A-R 2. Assertion: Capital is a flow variable.

Reason: A flow variable is measured over a period of time.

A-R 3. Assertion: GNP can be greater than GDP.

Reason: GNP equals GDP plus net factor income from abroad, which can be positive.

A-R 4. Assertion: A rise in GDP always raises the welfare of all the people of a country.

Reason: The increase in GDP may be unequally distributed and may ignore externalities.

A-R 5. Assertion: Real GDP is a better measure than nominal GDP for comparing output over time.

Reason: Real GDP is evaluated at constant base-year prices, so changes in it reflect changes in the volume of output.

Answer key: 1-(A), 2-(D), 3-(A), 4-(D), 5-(A).

Exam Tips & Common Mistakes

How to score full marks in this chapter

Memorise the chain of aggregates as a ladder — GDPMP → (+NFIA) GNPMP → (−Dep) NNPMP → (−NIT) NNPFC/NI → PI → PDI — and learn what is added or subtracted at each step. In numericals, always write the formula first, then substitute values with units (Rs crore), and show each step. Remember that “net” means after depreciation, “factor cost” means after removing net indirect taxes, and “national” means after adding NFIA. State whether each variable is a stock or a flow when asked. For deflator/CPI questions, write the ratio × 100 and interpret the result (above 100 = prices risen; below 100 = prices fallen).

Common mistakes to avoid

  • Adding the value of intermediate goods separately — this causes double counting.
  • Confusing stocks (capital, inventory) with flows (income, investment, change in inventory).
  • Mixing up the direction of adjustments: NFIA is added to GDP; depreciation and net indirect taxes are subtracted.
  • Forgetting that “net interest paid by households” = interest paid − interest received (can be negative).
  • In the deflator question, dividing real by nominal instead of nominal by real.
  • Treating budget deficit (G − T) and trade deficit (M − X) signs carelessly in the savings–investment identity.

Frequently Asked Questions

What is Chapter 2 of Class 12 Economics (Introductory Macroeconomics) about?

Chapter 2, National Income Accounting, explains final and intermediate goods, stocks and flows, the three methods of measuring GDP (product/value-added, expenditure and income), the family of income aggregates (GDP, GNP, NNP at market price and factor cost, NI, PI, PDI), the price indices (GDP deflator, CPI, WPI), and the limitations of GDP as an index of welfare.

What are the three methods of calculating GDP?

The three methods are the product/value-added method (GDP = sum of gross value added of all firms), the expenditure method (GDP = C + I + G + X − M) and the income method (GDP = wages + profit + interest + rent). All three give the same value because the same income flows in a circle through the economy.

How do you move from GDP at market price to National Income?

Add Net Factor Income from Abroad to GDPMP to get GNPMP, subtract depreciation to get NNPMP, then subtract net indirect taxes (indirect taxes − subsidies) to get NNP at factor cost, which is National Income.

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