Effects and uses: real wages, real interest rates, indexation and the inflation target

Detail

1. What each index is used for

• Consumer Price Index (CPI) measures the change in retail prices of a fixed basket of goods and services that households buy. It is used for:
• wage negotiation, meaning deciding how much pay should rise;
• income policy and price policy;
• rent control;
• taxation;

• general economic policy.

• Wholesale Price Index (WPI) is used for:

• deflating national income and capital formation, which means removing the effect of price rise so that only the change in real output is left;

• measuring general inflation.

• Index of Industrial Production (IIP) gives a picture of industrial output in quantities, not prices.

• The new CPI (base 2024 = 100) was first released by MoSPI/NSO on 12 February 2026. It replaces the base 2012 = 100 series [2].
• Its weights come from the Household Consumption Expenditure Survey (HCES) 2023-24 [2][3].
• It covers 1,465 rural markets and 1,395 urban markets in 434 towns. It also covers 12 online markets in towns with more than 25 lakh people [3].
• The number of weighted items went up from 299 to 358: goods from 259 to 308 and services from 40 to 50 [3].
• Items are now grouped in 12 divisions under the UN's COICOP 2018 classification, in place of the old 6 groups [2].
• Basic item prices are averaged with the Jevons index (a geometric mean). The higher levels are built with the Young/Modified Laspeyres index [3].
• First CPI inflation on the new base: 2.75% (January 2026, provisional). Rural was 2.73% and urban 2.77%. Food inflation (CFPI, the Consumer Food Price Index) was 2.13% [2].

• Last reading on the old base: CPI inflation 1.33% (December 2025, final). CFPI was −2.71%, meaning food prices were lower than a year earlier [2].

• Linking factor: a number used to turn old-series index values into new-base values. This lets you compare prices over a long period.

• Formula: linked index = old-series index × linking factor.
• The linking factor for CPI Combined is 0.5267. For Rural it is 0.5222 and for Urban 0.5320 [3].
• Worked example: December 2025 on the old base = 198.0 [2]. Then 198.0 × 0.5267 ≈ 104.3 on the 2024 base.
• Because the old and new classifications differ, the two series can be linked only at the general index level [2].

2. Purchasing power of money

• Purchasing power of money is how much ₹1 can buy compared with the base year.
• Formula: Purchasing power = 1 / cost-of-living index. Take the index as a ratio, so multiply by 100.
• NCERT example: CPI (1982 = 100) was 526 in January 2005. So ₹1 = 100/526 = ₹0.19. A 2005 rupee bought only what 19 paise bought in 1982.
• New-base example: CPI (2024 = 100) was 104.46 in January 2026 [2]. So ₹1 = 100/104.46 ≈ ₹0.96 of 2024 value.

3. Real wage

• Money wage (nominal wage): the rupees actually paid.
• Real wage: what that pay can buy at base-year prices.
• Formula: Real wage = (Money wage / CPI) × 100.
• NCERT example: ₹10,000 × 100/526 = ₹1,901 in 1982 terms.
• A worker who earned ₹3,000 in 1982 is worse off earning ₹10,000 in 2005. The ₹10,000 buys only what ₹1,901 bought in 1982.

• Salary needed to keep the 1982 living standard = ₹3,000 × 526/100 = ₹15,780.

• Exercise (Class 11, Index Numbers, Q17):

• Base salary ₹4,000 and CPI 400. Required salary = 4,000 × 400/100 = ₹16,000.

• The current salary is ₹6,000, so it must rise by 16,000 − 6,000 = ₹10,000.

• Key rule: if money wages rise more slowly than the CPI, the real wage falls, even though the pay slip shows more rupees.

4. Indexation

• Indexation means adjusting incomes, debts or asset costs for inflation, so their real value stays the same.
• Wage indexation: raising wages in line with the CPI.

• If the index stands at 150, wages must rise by 50% to keep the base-year living standard.

• Dearness Allowance (DA): a cost-of-living payment to central government employees. Pensioners get the same payment, called Dearness Relief (DR).

• DA is revised twice a year, with effect from 1 January and 1 July. PIB releases announce DA instalments "due from 01.07.2022" and "w.e.f. 01.01.2025" [8][9].
• The index used is CPI-IW (CPI for Industrial Workers). Its main use is to set the DA of government employees and industrial workers [7].
• CPI-IW was moved to a 2016 = 100 base, replacing the 2001 = 100 base (October 2020) [7].
• DA is a percentage of basic pay and follows a formula recommended by the Central Pay Commission. For example, in 2016 DA rose by 6 percentage points, from 119% of basic pay, under the 6th CPC formula [6].
• Recent example: the Cabinet approved an additional 3% DA/DR instalment (October 2025, PIB) [5].

• Worked example (made-up numbers): basic pay ₹50,000 and DA rate 50% → DA = ₹25,000. If DA rises by 3 points to 53% → DA = ₹26,500.

• Pensions: Dearness Relief protects the real value of a pension.

• Tax brackets and "bracket creep":
• Bracket creep happens when inflation pushes a person's money income into a higher tax slab, even though their real income has not grown.
• Result: the person pays a larger share of tax on the same purchasing power.

• Indexing tax slabs to prices prevents this. India does not index its slabs automatically; the Budget revises them from time to time.

• Capital gains and the Cost Inflation Index (CII):

• CII is an index notified by the CBDT. It raises the purchase cost of an asset, so that only the real gain is taxed.
• Formula: Indexed cost = Purchase cost × (CII of year of sale / CII of year of purchase).
• CII for 2024-25 = 363. It applies from 1 April 2025, that is, from assessment year 2025-26 [4].
• Worked example (made-up numbers): an asset bought for ₹10 lakh when the CII was 250 is sold when the CII is 363. Indexed cost = 10 × 363/250 = ₹14.52 lakh. If the sale price is ₹20 lakh, the taxable gain is ₹5.48 lakh, not ₹10 lakh.

• Budget July 2024: indexation was largely removed for long-term capital gains (LTCG). A lower flat rate was brought in, with limited relief kept for some older land and building holdings (verify current).

• Inflation-indexed bonds: bonds whose principal or coupon (the interest payment) is linked to a price index. The investor's real return is protected.

5. Who gains and who loses from inflation

• Losers:
• Creditors (lenders): they get back rupees that buy less.
• Fixed-income earners: pensioners without indexation and salaried workers without DA.

• Cash holders: cash earns no interest, so it loses value every year.

• Gainers:

• Debtors (borrowers): they repay loans in cheaper rupees.
  • Example: a loan at 8% interest with 6% inflation costs only about 2% in real terms.

• The government is the biggest debtor, so inflation lowers the real burden of public debt.

• The poor lose most:

• Food is a large share of their spending. Food and beverages carry a weight of 44.8% in the rural CPI but 34.3% in the urban CPI (2024 series, old-style grouping) [3].
• They hold few assets that keep pace with inflation, such as land, shares or gold.

• Free social transfers, such as free PDS grain, are left out of the CPI because households do not pay for them. This follows the IMF CPI manual [3].

• Inflation tax: the hidden loss of purchasing power borne by holders of money and fixed-income assets when the government pays for its spending by printing money.

• Worked example: ₹10,000 in cash with 5% inflation is worth 10,000/1.05 = ₹9,524 after one year. The hidden "tax" is about ₹476.

6. Real interest rate

• Nominal interest rate: the rate written on the loan or deposit.
• Real interest rate: the return after taking away inflation.
• Fisher relation (approximate): Real rate = Nominal rate − (expected) inflation.
• Exact form: (1 + real rate) = (1 + nominal rate)/(1 + inflation).
• NCERT-style example: a 7% FD with 6% inflation gives a real return of about 1%. The exact figure is 1.07/1.06 − 1 = 0.94%.

• Recent example: the same 7% FD with CPI inflation of 2.75% (January 2026) [2] gives a real return of about 4.25%.

• Ex-ante vs ex-post:

• The ex-ante real rate uses expected inflation. This is what drives decisions to save and invest.

• The ex-post real rate uses the inflation that actually happened.

• Negative real rates: when inflation is higher than the deposit rate.

• Savers' real returns fall below zero.
• Households move money out of bank deposits into gold, real estate or equities.
• Banks then find it harder to raise deposits.

7. CPI-C as the policy anchor: flexible inflation targeting

• Flexible inflation targeting (FIT): the central bank's main goal is a set inflation number. It may still pay attention to growth in the short run.
• Recommended by the Urjit Patel Committee (2014).
• Given legal backing by the RBI Act amendment (2016).
• Target: 4% CPI-Combined, with a band of 2–6%. The target is reviewed every five years.
• The first target period ran from 2016 to March 2021. A March 2026 notification is reported to renew the same 4% (2–6%) target from 1 April 2026 to 31 March 2031 (not confirmed from a whitelisted source; verify current).

• Details of the Monetary Policy Committee (MPC) are in banking-monetary-policy.

• Why CPI and not WPI:

• CPI tracks the prices people actually pay, including services.
• WPI has no services and tracks producer and wholesale prices.

• Inflation expectations, and so wage demands, follow retail prices.

• Base revision and the target: the 2024 CPI series lowers the weight of food and beverages.

• Under the old grouping, the weight falls from 45.86% to 40.10% [3].
• Under the new COICOP grouping, it is 36.75% in the 2024 series, against about 42.62% if the 2012 series were regrouped the same way [3].

• Result: headline CPI now reacts less to swings in vegetable prices.

• The government's supply-side tools against food inflation (detail in agri-marketing-msp-pds):

• release of buffer stocks, for example open-market sales of wheat and rice;
• stock limits on traders, so they cannot hoard;
• export curbs or bans (wheat, rice, onion);
• import-duty cuts (edible oils, pulses).
• Cost: these tools lower consumer prices but can depress farmers' incomes. For example, onion prices were −29.27% and tur (arhar) prices −24.90% year-on-year in January 2026 [2]. Such falls help consumers but hurt growers.

Prelims Hooks

• Real wage = (money wage / CPI) × 100. Purchasing power of money = 1 / cost-of-living index.
• Fisher relation: real interest rate ≈ nominal rate − expected inflation. A 7% FD with 6% inflation gives about a 1% real return.
• DA and DR for central government staff are revised twice a year (1 January and 1 July) using CPI-IW, not CPI-C. Trap: CPI-C is the inflation-target index; CPI-IW is the DA index.
• CPI-IW base = 2016 (revised in 2020 from 2001) [7]. Headline CPI base = 2024 (first released 12 February 2026, using HCES 2023-24 weights) [2][3].
• Cost Inflation Index is notified by the CBDT for capital-gains indexation. CII for 2024-25 = 363 [4].
• Inflation target: 4% CPI-C with a 2–6% band. Recommended by the Urjit Patel Committee (2014) and made law by the RBI Act amendment (2016).
• Inflation redistributes income from creditors to debtors. The government, as the largest debtor, gains.
• CPI 2024 series: 358 items, 12 COICOP divisions, Jevons index at the elementary level, and 12 online markets. Rural house rent is included for the first time [2][3].
• Bracket creep means inflation pushes taxpayers into higher slabs without any rise in real income. Indexing the slabs is the remedy.

Mains Points

• Inflation is a regressive tax.
• The poor spend a larger share on food (rural CPI food weight 44.8% against urban 34.3%, 2024 series) and have no indexed income [3].
• Organised workers have DA, but informal workers do not.

• This argues for keeping inflation low and stable, and for indexing welfare transfers.

• Real interest rates link savers, borrowers and policy.

• Negative real rates push households towards gold and real estate and hurt deposit growth. This weakens financial saving.
• High positive real rates can choke investment.

• The 4% target tries to keep real rates moderately positive.

• Indexation is a trade-off.

• DA, DR and CII protect real incomes and ensure only real gains are taxed.
• But wide indexation can build inflation into the economy through a wage-price spiral, where higher wages push up prices and higher prices push up wages.

• Removing LTCG indexation (2024) made tax simpler but taxes part of gains that come only from inflation.

• Base revision affects monetary policy.

• The lower food weight in CPI 2024 (36.75%) [3] makes headline CPI a better guide for monetary policy, which cannot fix supply shocks.
• Food shocks still call for the government's supply-side tools. These trade off consumer relief against farm incomes.