Value Added in a Paddy-to-Bread Chain
In a block of Thanjavur district three production units operate: a paddy farmer, a rice mill and a bakery. In 2023-24 the farmer sells paddy worth ₹5 lakh, all of it to the mill. The mill sells rice worth ₹8 lakh to the bakery and rice worth ₹2 lakh to traders outside the block. The bakery sells bread worth ₹12 lakh to households in the block. In the same year, a household in the block sells a second-hand motorbike for ₹40,000, a college student receives a government scholarship of ₹15,000, and a nurse from the block working in Singapore sends ₹60,000 to her parents. The block statistical officer has been asked to report the income originating in the block and is unsure what to count. A panchayat member claims that total output is ₹27 lakh (₹5 + ₹10 + ₹12 lakh) and that the officer's smaller figure under-reports the block's income.
1. Compute the block's GDP at market price by the value-added (product) method, and explain why summing the three outputs is wrong.
Read the worked answer
Value added = value of output − intermediate consumption
| Unit | Value of output (₹ lakh) | Intermediate consumption (₹ lakh) | Value added (₹ lakh) |
|---|---|---|---|
| Farmer | 5 | 0 | 5 |
| Rice mill | 8 + 2 = 10 | 5 (paddy) | 5 |
| Bakery | 12 | 8 (rice) | 4 |
| GDP at market price | 14 |
Cross-check by final expenditure: bread bought by households ₹12 lakh + rice exported out of the block ₹2 lakh = ₹14 lakh. The two methods agree, as they must.
Why ₹27 lakh is wrong. The paddy is counted three times in that figure: once as the farmer's sale, again inside the mill's ₹10 lakh, and a third time inside the bakery's ₹12 lakh. The mill's ₹10 lakh includes the ₹5 lakh of paddy it bought in; the bakery's ₹12 lakh includes the ₹8 lakh of rice it bought in. Adding outputs double-counts intermediate goods. The value-added method counts only the new value created at each stage - ₹5 lakh of paddy production, ₹5 lakh of milling and transport services, ₹4 lakh of baking - and stops at the final user. A further caution: the ₹2 lakh of rice sold outside the block is a final good here only because no unit inside the block uses it; if a fourth unit inside the block had bought it, it would have been intermediate consumption.
2. State with reasons whether each of the following should enter the block's income: (a) the second-hand motorbike sale, (b) the scholarship, (c) the ₹60,000 sent by the nurse.
Read the worked answer
(a) Second-hand motorbike, ₹40,000 - exclude. The motorbike was produced in an earlier year and its value was counted then. A resale between households is a transfer of an existing asset, not current production. Counting it would both overstate this year's product and double-count the same good. The only part that belongs to the current year is any commission earned by a dealer, because that is a service produced now.
(b) Scholarship, ₹15,000 - exclude from domestic product. It is a transfer payment: the government transfers purchasing power without receiving any goods or service in return in the current period. Transfers redistribute income; they do not create it. It is part of personal income but not of GDP.
(c) Nurse's remittance, ₹60,000 - exclude from the block's domestic product, but include in national income. The nursing service was produced abroad, so it is not domestic product. However, the nurse is a normal resident of India, so her earnings are factor income from abroad. In the move from GDP to GNP we add net factor income from abroad: GNP = GDP + NFIA. If this ₹60,000 is the only such flow and there are no offsetting factor payments made to non-residents, the block's GNP = ₹14 lakh + ₹0.6 lakh = ₹14.6 lakh. The distinction to state clearly is domestic (produced within the boundary) versus national (earned by normal residents).
3. Suppose the same quantities were produced but prices were 10 per cent higher, and the block's GDP at current prices came to ₹15.4 lakh. Find real GDP and the GDP deflator, and explain why real GDP is the better measure.
Read the worked answer
Setup. Quantities are unchanged, so the entire rise from ₹14 lakh to ₹15.4 lakh is a price effect; the price index is 110.
Real GDP = (Nominal GDP ÷ Price index) × 100 = (15.4 ÷ 110) × 100 = ₹14 lakh
GDP deflator = (Nominal GDP ÷ Real GDP) × 100 = (15.4 ÷ 14) × 100 = 110
Interpretation. Nominal GDP appears to have grown by ₹1.4 lakh, or 10 per cent. Real GDP is exactly what it was in the base year, so the block has produced precisely the same quantity of paddy, milling services and bread as before. Measured at constant prices, growth is zero.
Why real GDP is preferred
- Nominal GDP changes when either quantities or prices change; real GDP changes only when quantities change, so it measures actual output.
- A price rise raises nominal GDP without any household being better off, so nominal figures cannot be used for welfare comparisons or for comparing one year with another.
- Per capita real GDP - real GDP divided by population - is the standard indicator of average living standards, and growth rates in official statistics are computed on constant-price series.
The examiner's point: the deflator converts a current-price total into a constant-price total; it does not create new production.