Building blocks: final vs intermediate goods, stocks vs flows, investment and depreciation

Detail

1. Why these building blocks matter

• National income accounting tries to add up everything an economy produces in a year.
• To do this correctly, we must answer three questions first:
• Which goods to count? Only final goods (not intermediate goods).
• When to measure? Over a period (flow) or at a moment (stock).

• What part of output adds to future capacity? Investment, after subtracting depreciation.

• Current Indian series: MoSPI's National Statistics Office (NSO) released a new GDP series with base year 2022-23 on 27 February 2026. It replaced the 2011-12 base series. Nominal GDP for the base year 2022-23 is ₹261.18 lakh crore [2].

• The new series brought changes in estimation method, new high-frequency indicators (monthly or quarterly data such as GST returns), a better deflation strategy and more detailed estimates [2].

2. Final goods vs intermediate goods

Final goods

• Final good: a good meant for final use. It will not pass through any further stage of production.
• A good is final or not because of how it is used, not because of what it is.
• Tea leaves bought by a household for home brewing are a final good. Home cooking is not counted as an economic activity, so no more value is added in the accounts.

• The same tea leaves bought by a restaurant are an input. The restaurant adds value (labour, gas, service) and sells cups of tea.

• The same logic applies to many goods. For example, milk bought by a family is final, but milk bought by a sweet shop is intermediate.

Intermediate goods

• Intermediate goods: material inputs that are used up in producing other goods, e.g. steel sheets for cars, or copper for utensils. They are not final goods.
• Production chain example: cotton (farmer) → yarn (spinning mill) → cloth (textile mill) → garment (final good sold to the consumer).
• UN System of National Accounts (SNA 2008) (the global rulebook that countries follow when they build national accounts) uses a related term:
• Intermediate consumption: goods and services used up as inputs in production during the accounting period [3].

• Final consumption: goods and services used by households or the community to meet their individual or shared needs [3].

• Key difference: fixed assets (machines, buildings) are used in production but are not intermediate consumption. Their wear and tear is recorded separately as consumption of fixed capital (see Section 6) [3].

3. Types of final goods

Type	Examples	Key feature
Consumer goods (non-durables and services)	Food, clothing, recreation services	Used up when the final consumer buys and consumes them
Consumer durables	TV sets, cars, home computers	Used for consumption but last long. Like machines, they need repair and maintenance
Capital goods	Tools, implements, machines, buildings	Help production without being transformed themselves. Used over many production cycles. Suffer wear and tear

• Trap: a car is a consumer durable when a family buys it. It is a capital good when a taxi company buys it. Once again, the use decides the category.
• In India's accounts, spending on these goods appears as PFCE (Private Final Consumption Expenditure, what households spend on consumption) and GFCF (Gross Fixed Capital Formation, spending on new fixed assets) [2].

4. Measuring output: money as the common measure, and double counting

Why use money?

• You cannot add metres of cloth to tonnes of rice. So all output is valued in money (₹), which acts as a common measuring rod.

Count only final goods

• The price of a final good already includes the value of all intermediate goods used to make it.
• If intermediate goods are also counted separately, the same value is counted again and again. This is double counting, and it greatly overstates output.

Worked example (garment chain):

Stage	Sale value (₹)	Cost of inputs bought (₹)	Value added (₹)
Farmer sells cotton	100	0	100
Mill sells yarn	180	100	80
Textile mill sells cloth	300	180	120
Tailor sells garment (final)	450	300	150
Total	1,030 (wrong: double counted)	—	450

• Adding all sales = ₹1,030. This is wrong because cotton is counted four times, yarn three times, and so on.
• Value of the final good = ₹450 = sum of values added (100 + 80 + 120 + 150). This is the correct figure.
• Two correct ways to avoid double counting:
• Final product method: count only the final good's value.

• Value added method: Value added = Value of output − Value of intermediate consumption. Then add value added across all firms. This gives GVA (Gross Value Added).

• Link to official data: India's GVA at basic prices in 2024-25 was ₹288.54 lakh crore at current prices (2022-23 series) [2].

5. Stocks vs flows

Definitions

• Stock variable: measured at a point of time. Examples: capital stock, inventory, money supply, wealth.
• Flow variable: measured over a period of time. Examples: income, output, profits, investment, change in stock.
• A flow has no meaning without a time unit. "Salary ₹10,000" is incomplete until you say per month or per year.

Tank-and-tap analogy

• The water flowing in through the tap per minute is a flow.
• The water in the tank at a given moment is a stock.
• Flows change stocks: Stock at end of year = Stock at start + Inflow − Outflow.

Capital stock vs flow of investment

• Capital stock: all capital goods an economy has at a point of time.
• A machine stays in the capital stock for many years. It is part of the flow of new machines (investment) only in the year it is installed.
• MoSPI's view: capital stock is the reproducible part of national wealth (wealth that can be produced again). It has two parts: fixed assets and inventories (stocks of goods) [4].
• MoSPI estimates capital stock with the Perpetual Inventory Method (PIM). It adds up past investment flows and removes assets as they reach the end of their service life. Estimates of depreciation come out of the same exercise [4].

Worked example (inventory):

• A firm's inventory on 1 April = 500 units (stock).
• During the year: produced 2,000 units, sold 1,800 units (both flows).
• Change in stock = 2,000 − 1,800 = +200 units (a flow, which counts as inventory investment).
• Inventory on 31 March = 500 + 200 = 700 units (stock).
• In India's accounts this item is called Changes in Stocks (CIS). It was ₹3.82 lakh crore (1.2% of GDP) in 2024-25 at current prices [2].

Stock (point of time)	Related flow (per period)
Capital stock	Investment (capital formation)
Inventory	Change in inventory
Wealth	Saving / income
Money supply	Change in money supply

6. Investment and depreciation

Investment (economic meaning)

• Investment = capital formation. It means an addition to physical capital (machines, buildings, roads) and to inventories.
• Not investment in economics: buying shares, buying existing property, or buying an insurance policy. These only transfer ownership of assets that already exist. They are financial investments, not additions to physical capital.
• Official breakdown in India: Gross Capital Formation (GCF) = GFCF + Changes in Stocks + Valuables [2].
• Valuables are items like gold and jewellery held as a store of value [2].
• Under SNA 2008, spending on R&D (research and development) is treated as investment (GFCF), not as current expense [3].

Gross investment

• Gross investment: the part of final output that consists of capital goods. It includes capital goods that only replace worn-out capital.

Depreciation (consumption of fixed capital)

• Depreciation, or Consumption of Fixed Capital (CFC), is an annual allowance for expected wear and tear of capital goods.
• NCERT formula (straight-line method):
• Depreciation per year = Cost of capital good ÷ Years of useful life.

• A 20-year machine loses 1/20 of its value each year. NCERT assumes this constant rate. Real accounts may use other methods.

• It is an accounting concept. No actual spending may happen in a given year. But across thousands of firms, actual replacement spending roughly equals total depreciation.

• It excludes unexpected destruction from accidents, natural calamities and similar events.
• SNA 2008 definition: CFC is the fall, during the accounting period, in the current value of fixed assets owned and used by a producer because of physical deterioration, normal obsolescence (becoming outdated in the expected way) or normal accidental damage [3].
• Losses from major disasters or wars are not counted in CFC. They are recorded separately as other changes in the volume of assets [3].

Net investment

• Net investment = Gross investment − Depreciation. This is the true addition to the capital stock.
• Worked example:
• A firm buys a machine for ₹20 lakh with a 20-year life → depreciation = 20 ÷ 20 = ₹1 lakh per year.
• Suppose the economy's gross investment in a year = ₹100 crore and depreciation = ₹30 crore.
• Net investment = 100 − 30 = ₹70 crore.
• Capital stock at end of year = Opening capital stock + ₹70 crore.
• If gross investment were only ₹30 crore, net investment would be zero. The capital stock would only be kept intact, not increased.

The same idea in India's official data (current prices, 2022-23 base)

• Official identity: NDP/NNI = GDP/GNI − CFC [2].
• CFC: ₹39.47 lakh crore (2023-24) → ₹42.54 lakh crore (2024-25) [2].

• This is about 13.4% of GDP in 2024-25 (42.54 ÷ 318.07) [2].

• GCF: ₹100.00 lakh crore (2023-24) → ₹109.25 lakh crore (2024-25). GCF-to-GDP rate = 34.3% (2024-25) [2].

• GFCF: ₹100.65 lakh crore, or 31.6% of GDP (2024-25) [2].
• Net capital formation (derived): 109.25 − 42.54 ≈ ₹66.71 lakh crore (2024-25). This is the real addition to India's capital stock that year [2].
• Saving side: Gross saving ₹111.13 lakh crore, and net saving (gross saving − CFC) ₹68.59 lakh crore (2024-25) [2].
• GDP vs NDP: GDP ₹318.07 lakh crore vs NDP ₹275.53 lakh crore (2024-25). The gap is exactly CFC [2].

7. Trade-off between consumption goods and capital goods

• In a given year, total output is fixed. More capital goods means fewer consumer goods.
• Over time, more capital raises the economy's capacity to produce.
• A traditional weaver takes months to make one sari. Modern mills make thousands of garments a day.

• So there is no contradiction. Less consumption today → more capital → more output and consumption tomorrow.

• Indian pattern: in 2024-25, about 56.5% of GDP went to private consumption (PFCE) and about 31.6% to fixed capital (GFCF), at current prices [2].

• Growth check: in the 2025-26 Second Advance Estimates (Feb 2026), both PFCE and GFCF grew by more than 7% in real terms [2].

Prelims Hooks

• Whether a good is final or intermediate depends on its use, not its nature. Tea leaves are final for a household but intermediate for a restaurant.
• Double counting is avoided by counting only final goods, or by adding value added (output − intermediate consumption) at each stage.
• Stock = at a point of time (capital stock, inventory, money supply, wealth). Flow = over a period (income, output, investment, change in inventory). Trap: "change in stock" is a flow.
• Investment in economics = physical capital formation. Buying shares, existing property or an insurance policy is not investment.
• Net investment = Gross investment − Depreciation. NDP = GDP − CFC [2].
• GCF = GFCF + Changes in Stocks + Valuables (India's expenditure-side identity) [2].
• CFC covers normal wear and tear, normal obsolescence and normal accidental damage. It excludes unexpected losses from calamities [3].
• MoSPI estimates capital stock and CFC by the Perpetual Inventory Method [4].
• India's new GDP base year is 2022-23, released 27 Feb 2026 by NSO, MoSPI. The earlier base year was 2011-12 [2].
• Under SNA 2008, R&D spending counts as gross fixed capital formation [3].

Mains Points

• Consumption vs investment trade-off (GS-III, growth): India keeps GCF at about 34% of GDP (2024-25) [2]. This means lower consumption today in return for higher capacity later. The Harrod-Domar logic follows: a higher investment rate plus good capital productivity gives faster growth.
• Gross vs net matters for welfare: CFC was about ₹42.5 lakh crore (2024-25), around 13% of GDP [2]. So headline GDP overstates the resources actually available. NNI/NDP is a better base for judging sustainable income. Depreciation of natural capital is not deducted at all, which supports the case for Green GDP.
• Quality of investment: Rising valuables (gold) in GCF, ₹4.77 lakh crore in 2024-25 [2], add to measured capital formation. But they do not expand productive capacity the way machines and roads do. Policy should push household savings towards financial assets and productive fixed capital.
• Measurement reform (GS-III, statistics): The 2022-23 rebase brought new high-frequency data and a better deflation strategy [2]. Up-to-date classification of intermediate vs final use (e.g. R&D and software as capital under SNA 2008 [3]) directly changes measured GDP, investment rates and cross-country comparisons.