Mod 6: Stocks & Flows, Final & Intermediate Goods, Investment & Capital Formation

📖 Chapter 1 🧩 Module 7 of 11 ⏱️ ~8 min read 💡 21 MCQs

Topic Part 1 of 2

Concept

6.1 Stocks and flows: income is a flow, wealth is a stock

🏫 School level · NCERT Class 9–12 (the base for UPSC, BPSC, SSC and Bank exams)

At a point of time versus over a period of time

Some economic variables are measured at a point of time; others are measured over a period of time. The first kind is a stock, the second a flow. Think of a water tank: the water in it at 9 a.m. is a stock; the water flowing in per minute is a flow.

Fig 6.1 A flow changes a stock: net investment (flow) adds to the capital stock.

Table 6.1 Stocks and flows
Stock (at a date)	Related flow (per period)
Capital (machines, buildings)	Investment, depreciation
Wealth of households on 31 March	Income, saving during the year
Money supply on a date	Spending of money during a month
Population (Census day)	Births and deaths per year
Foreign exchange reserves (RBI, weekly)	Exports, imports, capital inflows
Government debt	Fiscal deficit (new borrowing in a year)
Bank deposits	Interest earned per year

Stock–flow link

Kₜ = Kₜ₋₁ + Net investment

closing capital stock = opening stock + net investment of the year

Debt–deficit link

Debtₜ = Debtₜ₋₁ + Fiscal deficit

a deficit (flow) adds to debt (stock)

💡 One-second test

Ask: “Does it make sense only with per year / per month attached?” If yes, it is a flow (income ₹50,000 per month). If it makes sense “as on” a date, it is a stock (₹2 lakh in the bank as on 31 March). National income is a flow; national wealth is a stock.

⭐ Key Points for Exams

Stock: at a point of time. Flow: over a period of time.
Income, investment, depreciation, exports, fiscal deficit are flows.
Wealth, capital, money supply, population, forex reserves, debt are stocks.
Flows change stocks: Kₜ = Kₜ₋₁ + net investment.

📌 Quick-Fire One-Liners

Is national income a stock or a flow? Answer: Flow
Is government debt a stock or a flow? Answer: Stock
Which flow adds to government debt? Answer: Fiscal deficit

Topic

Questions

MCQs

Answer this question, then use Next.

Which of the following is a stock, not a flow?

Explanation: Wealth on a date is a stock. Income, spending, and exports are measured over a period, so they are flows. A stock is measured at a point of time (wealth, capital, money supply, population, foreign exchange reserves). A flow is measured per period of time (income, investment, depreciation, exports, interest). Ask: does it need “per year” to make sense?

[School] Which of the following is a flow variable?

Investment is measured over a period (a year), so it is a flow. The other three are measured at a point of time, so they are stocks.

[SSC pattern] Depreciation is a:

Depreciation is the wear and tear of fixed capital during a period (for example, ₹120 crore in a year), so it is a flow that reduces the capital stock.

[Bank PO pattern] The foreign exchange reserves reported by the RBI for a particular week are a:

Reserves are the amount held “as on” a date, so they are a stock. Exports, imports and capital inflows during the week are flows that change the stock.

[School] The relation between net investment and capital stock is:

A flow changes a stock: Kₜ − Kₜ₋₁ = net investment. Gross investment minus depreciation gives net investment.

[UPSC level] Government debt and fiscal deficit are, respectively:

Debt is the total outstanding at a date (stock). The fiscal deficit is new borrowing during a year (flow); each year’s deficit adds to the debt.

[School] In the water-tank analogy for stocks and flows, the water level at 9 a.m. stands for:

The quantity in the tank at a moment is a stock; water coming in or going out per minute is a flow. Inflows minus outflows change the level.

Question 1 of 7

One-liners

Write your answer, then submit to see the correct answer.

Is national income a stock or a flow?

Flow

Is government debt a stock or a flow?

Stock

Which flow adds to government debt?

Fiscal deficit

Question 1 of 3

Topic Part 1 of 2

Concept

6.2 Final and intermediate goods, investment, depreciation and the capital–output ratio

🏫 School level · NCERT Class 9–12 (the base for UPSC, BPSC, SSC and Bank exams)

Count final goods once; only net investment adds to capital

National income counts only final goods and services, those bought for final use (consumption or investment) and not for resale or further processing in the same year. Goods used up in producing other goods are intermediate goods; their value is already included in the price of the final good, so counting them again would be double counting.

Fig 6.2 Whether a good is final or intermediate depends on its use, not on what it is.

Table 6.2 Classification of goods (NCERT Class 12)
Type	Meaning	Examples
Consumption goods	Satisfy wants directly	Food, clothes, a haircut
— non-durable / semi-durable / durable	Used once / up to a year or so / many years	Milk / clothes, shoes / TV, car, fridge
Capital goods	Final goods used to produce other goods for many years; they depreciate	Machines, tractors, factory buildings
Intermediate goods	Used up within the year in producing other goods	Steel sheets for a car maker, flour for a bakery

📗 Investment, depreciation and capital formation

Investment (capital formation) = addition to the stock of capital during a year: new machines, buildings, roads (fixed investment) plus the change in stocks of unsold goods and raw materials (inventory investment).
Depreciation (consumption of fixed capital) = fall in the value of fixed capital from normal wear and tear, expected obsolescence and accidental damage that is normally insured.
Gross investment − depreciation = net investment; only net investment adds to the capital stock.
Buying shares or an old house is not investment in this sense: it only transfers ownership of an existing asset (a financial investment, not real capital formation).
Human capital formation: spending on education, health and training raises the productive capacity of people. Intangible investment: brands, intellectual property (software, patents), client databases.

Net investment

Net I = Gross I − Depreciation

Capital–output ratio

COR = K / Y

ICOR = ΔK / ΔY = investment needed for one more unit of output

Harrod–Domar growth

g = s / ICOR

growth rate = saving (investment) rate ÷ ICOR

Worked example

In a year an economy’s gross fixed capital formation is ₹500 crore, change in stocks is ₹40 crore and depreciation is ₹120 crore. The opening capital stock was ₹4,000 crore. Find gross investment, net investment and the closing capital stock. If the saving rate is 30% and ICOR is 4, what growth does the Harrod–Domar model predict?

Gross investment = 500 + 40 = ₹540 crore.
Net investment = 540 − 120 = ₹420 crore.
Closing capital stock = 4,000 + 420 = ₹4,420 crore.
g = s / ICOR = 30% / 4 = 7.5% a year.

₹540 crore; ₹420 crore; ₹4,420 crore; 7.5%

⭐ Key Points for Exams

Final vs intermediate depends on use, not on the good itself.
Count only final goods to avoid double counting.
Capital goods are final goods that depreciate.
Net investment = gross investment − depreciation.
Growth ≈ investment rate ÷ ICOR (Harrod–Domar).

📌 Quick-Fire One-Liners

Flour bought by a bakery is which kind of good? Answer: Intermediate good
Another name for depreciation? Answer: Consumption of fixed capital
Saving rate 30%, ICOR 3: growth? Answer: 10%

Topic

Questions

MCQs

Answer this question, then use Next.

[School] Milk bought by a household for drinking is a:

It reaches its final user and will not be resold or processed, so it is a final (consumption) good. The same milk bought by a tea stall to make tea is an intermediate good.

[School] Cloth bought by a tailoring firm to make shirts for sale is:

The cloth is used up in producing another good (shirts) within the year. Its value will be counted once, inside the price of the shirts.

[School] A sewing machine bought by the same tailoring firm is a:

The machine is used for many years and is not used up in one round, so it is a capital good. Capital goods are final goods (investment) and are counted in GDP; they depreciate over time.

[School] Intermediate goods are excluded from national income in order to avoid:

The value of wheat is already inside the price of flour, and the flour’s value inside the price of bread. Adding all three would count the wheat three times. Counting only final goods (or only value added at each stage) avoids this.

[Numerical] Gross investment is ₹540 crore and depreciation is ₹120 crore. Net investment is:

Net investment = gross investment − depreciation = 540 − 120 = ₹420 crore. Only this part adds to the capital stock.

[School] Depreciation (consumption of fixed capital) includes loss of value due to:

Depreciation covers expected loss: normal use, expected obsolescence and normal accidental damage. Unforeseen losses (war, earthquake) are capital losses, not depreciation. Share price changes are not production.

[School] Inventory investment means:

Inventory investment = closing stock − opening stock of goods held by firms. Together with fixed investment (factories, machines) it makes up gross capital formation. Buying shares is a financial transaction.

[UPSC level] An incremental capital–output ratio (ICOR) of 4 means:

ICOR = ΔK/ΔY. A higher ICOR means capital is used less productively. With a 30% investment rate and ICOR 4, growth ≈ 30/4 = 7.5% (Harrod–Domar).

Question 1 of 8

One-liners

Write your answer, then submit to see the correct answer.

Flour bought by a bakery is which kind of good?

Intermediate good

Another name for depreciation?

Consumption of fixed capital

Saving rate 30%, ICOR 3: growth?

10%

Question 1 of 3

Topic Part 1 of 2

Concept

🎯 Competitive Level (UPSC Pre · BPSC Pre · State PSC · SSC · Bank PO · RBI Grade B): Stocks, flows and investment in UPSC questions

Exam map
Exam	What it asks from this module
UPSC Prelims	definition of national income (2013); capital–output ratio (2018); intangible investment (2023)
BPSC / State PSC	stock vs flow, final vs intermediate goods, depreciation
SSC / Railways	which is a stock, which is a flow; examples of capital goods
Bank PO / RBI Grade B	ICOR and growth, gross vs net investment, debt vs deficit

🏆 Previous Year Question · UPSC Prelims 2013

UPSC CSE Prelims 2013

The national income of a country for a given period is equal to the (a) total value of goods and services produced by the nationals (b) sum of total consumption and investment expenditure (c) sum of personal income of all individuals (d) money value of final goods and services produced

Only final goods and services are counted, to avoid double counting; national income is measured in money.
(a) says “total value of goods” (includes intermediate goods), (b) leaves out government spending and net exports, (c) personal income includes transfers and excludes some incomes.

(d) money value of final goods and services produced

🏆 Previous Year Question · UPSC Prelims 2018

UPSC CSE Prelims 2018

Despite being a high saving economy, capital formation may not result in significant increase in output due to (a) weak administrative machinery (b) illiteracy (c) high population density (d) high capital-output ratio

Output added = investment ÷ ICOR. If ₹5 of capital is needed for ₹1 of extra output (high ICOR), even large saving and investment raise output only a little.
The other options may slow growth in general but do not explain the direct link between capital formation and output.

(d) high capital-output ratio

🏆 Previous Year Question · UPSC Prelims 2023

UPSC CSE Prelims 2023

Consider the investments in the following assets: 1. Brand recognition 2. Inventory 3. Intellectual property 4. Mailing list of clients. How many of the above are considered intangible investments? (a) Only one (b) Only two (c) Only three (d) All four

Intangible = no physical form: brand recognition, intellectual property and a client list.
Inventory (raw materials, unsold goods) is physical, so it is a tangible investment.

🏦 Bank PO / RBI Grade B angle

The Harrod–Domar model (used in India’s First Plan) links saving to growth: g = s ÷ ICOR. To raise growth, either raise the saving/investment rate or lower ICOR through better technology, faster project completion and less waste. Debt (stock) grows by the fiscal deficit (flow) each year: a favourite RBI Grade B and UPSC distinction.

⭐ Key Points for Exams

UPSC 2013: national income = money value of final goods and services.
UPSC 2018: high capital–output ratio blunts the effect of high saving.
UPSC 2023: brand, IP and client lists are intangible; inventory is tangible.

📌 Quick-Fire One-Liners

Is buying existing shares capital formation? Answer: No, it is a financial transaction

Topic

Questions

MCQs

Answer this question, then use Next.

[UPSC Pre 2013] The national income of a country for a given period is equal to the:

National income counts the money value of final goods and services, so intermediate goods are not double counted. (a) includes all goods, (b) omits government spending and net exports, (c) personal income includes transfers.

[UPSC Pre 2018] Despite being a high saving economy, capital formation may not result in significant increase in output due to:

A high capital–output ratio means a lot of capital is needed for each unit of extra output, so high saving and investment yield little additional output (growth = investment rate ÷ ICOR).

[UPSC Pre 2023] Consider the investments in the following assets: 1. Brand recognition 2. Inventory 3. Intellectual property 4. Mailing list of clients. How many of the above are considered intangible investments?

Brand recognition, intellectual property and a client mailing list have no physical form, so they are intangible. Inventory consists of physical goods, so it is tangible.

[RBI Grade B level] By the Harrod–Domar relation, if the investment rate is 30% of GDP and ICOR is 4, the expected growth rate is about:

g = s ÷ ICOR = 30 ÷ 4 = 7.5%. 12% would be 30 × 4 ÷ 10 (a wrong operation); lowering ICOR to 3 would raise growth to 10%.

[BPSC pattern] Which of the following is a durable consumer good?

A refrigerator is used by a household for many years, so it is a durable consumer good. Bread is non-durable; a factory machine is a capital good; electricity used in a factory is an intermediate input.

[UPSC level] Buying 100 shares of a listed company on the stock exchange is, in national income terms:

Buying existing shares only changes who owns an asset; no new machine or building is created. Real investment (capital formation) adds new physical or intangible capital.

Question 1 of 6

One-liners

Write your answer, then submit to see the correct answer.

Is buying existing shares capital formation?

No, it is a financial transaction

Question 1 of 1