If your notes say India’s Consumer Price Index has base year 2012 and that food carries a weight of about 46 per cent, they are out of date. Both of India’s price indices were rebuilt in 2026. The CPI moved to base 2024 in February and the Wholesale Price Index moved to base 2022-23 in June, each with new weights, a bigger basket and, in the WPI’s case, a whole new family of indices alongside it.
This is the third capsule in our series on the economy, explained in plain language for SSC, RRB NTPC, banking exams, State PSC and UPSC Prelims.
The Hinge: Ask Who Is Being Asked About the Price
Every difference between the two indices follows from one question: whose price is being recorded?
| Consumer Price Index | Wholesale Price Index | |
|---|---|---|
| Who is asked | A household, in a retail market | A producer or wholesaler, at the first point of bulk sale |
| Are services included? | Yes — rent, school fees, doctors, transport | No — goods only |
| Are taxes included? | Yes, the price you actually pay | No, excise and GST are excluded |
| Rural and urban versions? | Yes — Rural, Urban and Combined, because households differ | No — a factory gate is a factory gate |
| Who compiles it | National Statistics Office, Ministry of Statistics and Programme Implementation | Office of the Economic Adviser, Department for Promotion of Industry and Internal Trade, Ministry of Commerce and Industry |
Learn the question and you never have to memorise the table. A household pays rent and school fees, so the CPI has them. A wholesaler does not sell you a haircut, so the WPI does not. A household pays GST, so the CPI includes it; the WPI measures the price before tax, because tax is not what the producer receives.
What Changed in 2026, and Why It Matters
Both rebasings did the same thing: they replaced a basket built from old spending habits with one built from recent data.
| Old | New | |
|---|---|---|
| CPI base year | 2012 = 100 | 2024 = 100, first published 12 February 2026 |
| CPI weights derived from | Consumer Expenditure Survey 2011-12 | Household Consumption Expenditure Survey 2023-24 |
| CPI items priced | 299 (259 goods, 40 services) | 358 (308 goods, 50 services) |
| CPI price collection | Rural and urban markets | 1,465 rural and 1,395 urban markets across 434 towns, plus 12 online markets in towns of over 25 lakh people |
| WPI base year | 2011-12 | 2022-23, announced 15 June 2026 |
| WPI items | 697 | 957 |
| WPI weights derived from | Net Traded Value (output plus imports minus exports) | Gross Value of Output |
The twelve online markets are the detail worth noticing. A price index that never looks at what people buy on their phones has stopped describing the country it is measuring.
The Food Weight Fell, and That Changes the Headline
This is the single most consequential change, and the most likely to be asked.
| Group | Combined, 2012 | Combined, 2024 |
|---|---|---|
| Food and beverages | 45.86 | 40.10 |
| Pan, tobacco and intoxicants | 2.38 | 2.99 |
| Clothing and footwear | 6.53 | 6.38 |
| Housing | 10.07 | 11.88 |
| Fuel and light | 6.84 | 5.49 |
| Miscellaneous | 28.32 | 33.15 |
The rural shift is larger still: food fell from 54.18 to 44.80 in the rural basket, and housing appears in the rural index for the first time, at 5.53. The miscellaneous group — which holds health, education, transport and communication — is now a third of the whole basket.
Why it matters is arithmetic, not opinion. If food is 46 per cent of the basket, a 10 per cent jump in food prices adds about 4.6 percentage points to headline inflation. If food is 40 per cent, the same jump adds about 4.0. The same tomato crisis now moves the headline number less, and anybody comparing a 2026 inflation figure with a 2015 one is comparing two different baskets.
The change itself is not a statistical trick. It reflects a real finding from the Household Consumption Expenditure Survey 2023-24: Indian households now spend a smaller share of their money on food and more on services. That is what rising incomes look like in a price index.
Headline, Core and the Base Effect
- Headline inflation is the whole basket, the number in the newspaper
- Core inflation is headline minus food and fuel — the two most volatile groups, driven by monsoons and global oil rather than by domestic demand. A central bank watches core to see whether price pressure is broad or a passing shock
- The base effect is the trap. Inflation measures this month against the same month a year ago. If last year’s number was unusually high, this year’s inflation looks low even if prices have not fallen at all. A falling inflation rate never means falling prices — it means prices are rising more slowly
That last point is the one most readers get wrong, and it is worth saying to yourself twice. Prices fall only when inflation goes below zero, which is called deflation. Inflation slowing down is disinflation, and the two words are not interchangeable.
The Other Price Indices
Three more exist and each is asked about.
| Index | Who compiles it | What it is for |
|---|---|---|
| CPI-IW, for industrial workers | Labour Bureau, Ministry of Labour and Employment | Fixing dearness allowance for government employees and industrial workers. This is the one that decides a pay revision |
| CPI-AL and CPI-RL, for agricultural and rural labourers | Labour Bureau | Revising minimum wages for rural labour |
| GDP deflator | National Statistics Office | Nominal GDP divided by real GDP. It covers every good and service in the economy, not a fixed basket, so it is the broadest price measure of all — but it is quarterly and arrives late |
The deflator is the one worth understanding rather than memorising. CPI and WPI price a fixed list of things. The deflator simply asks how much of the growth in measured GDP was real output and how much was just higher prices. It has no basket and no weights, which makes it broad and slow.
Why India Added Producer Price Indices in 2026
The WPI has a hole in it: no services. In an economy where services are over half of output, an index that prices only goods cannot describe producer costs.
So alongside the new WPI, the Office of the Economic Adviser began publishing Producer Price Indices on base 2022-23:
- An Output PPI, measuring prices received by producers
- Service PPIs for seven services — banking, securities transactions, insurance, management of pension funds, railways, air passenger transport and telecom
- A trial Input PPI for manufacturing only, published on an experimental basis from March 2026
The difference between WPI and PPI is again about who is asked. The WPI records the price of a transaction in the wholesale market; the PPI records the price received by the producer, which is the cleaner measure and the international standard. Most large economies abandoned wholesale indices for producer indices decades ago. India has now built the PPI alongside the WPI rather than replacing it.
Which Index Does What
| Use | Index used |
|---|---|
| The inflation target the Monetary Policy Committee must hit | CPI-Combined — 4 per cent with a 2 to 6 per cent band |
| Dearness allowance for government employees | CPI-IW |
| Minimum wages for rural labour | CPI-AL and CPI-RL |
| Deflating output and trade data; tracking producer cost pressure | WPI, and now the PPIs |
| The broadest measure of economy-wide prices | GDP deflator |
The first row is the one that has carried the most marks since 2016. Before then India informally watched the WPI; the framework inserted into the Reserve Bank of India Act that year fixed the target in terms of the Consumer Price Index, because the point of the exercise is what a household pays, not what a factory charges.
Why a Reader Should Care
Inflation is the only number in the whole fiscal and monetary machine that reaches every household without being announced, debated or voted on. A tax needs Parliament. A price rise needs nothing.
Which basket is used therefore decides more than a statistic. It decides when the Reserve Bank raises rates, when dearness allowance goes up, and what the minimum wage is revised to. Changing the weight of food from 46 to 40 per cent quietly changes all three.
Practice Questions
Q1. The Consumer Price Index in India is now compiled on which base year?
(a) 2010 = 100 (b) 2011-12 = 100 (c) 2012 = 100 (d) 2024 = 100
Answer: (d) 2024 = 100 One of the wrong options is the base of the old series and another is the old base of the wholesale index, which is why this is worth getting right. The new series was first published on 12 February 2026, with weights from the Household Consumption Expenditure Survey 2023-24.
Q2. Which of these is NOT covered by the Wholesale Price Index?
(a) Manufactured products (b) Fuel and power (c) Services (d) Primary articles
Answer: (c) Services Three of the options are its major groups. The missing category is exactly the gap that led India to start publishing Producer Price Indices in 2026, including separate indices for seven service sectors.
Q3. The Wholesale Price Index is compiled by…
(a) The National Statistics Office (b) The Labour Bureau (c) The Office of the Economic Adviser, DPIIT (d) The Reserve Bank of India
Answer: (c) The Office of the Economic Adviser, DPIIT Each wrong option compiles a different price measure: one produces the consumer index and the GDP deflator, one produces the industrial-worker and rural-labour indices, and the fourth only uses the numbers. The correct body sits in the Ministry of Commerce and Industry.
Q4. In the new 2024 series, the weight of food and beverages in CPI-Combined is approximately…
(a) 54 per cent (b) 46 per cent (c) 40 per cent (d) 34 per cent
Answer: (c) 40 per cent Two of the wrong figures are real numbers from the same table: one is the old combined weight and another is the rural weight in the old series. The reduction reflects households spending a smaller share of their budget on food than they did in 2012.
Q5. Which index is used to fix dearness allowance for government employees?
(a) CPI-Combined (b) CPI-IW (c) WPI (d) The GDP deflator
Answer: (b) CPI-IW The one used is produced by the Labour Bureau rather than by the National Statistics Office, and it covers a specific population instead of the whole country. The first option is what the Monetary Policy Committee targets, which is a different job entirely.
Ten more questions on this and today’s Current Affairs explainer are waiting on our Test Your Knowledge page, with a free PDF. Today’s explainer is on the parliamentary report on reforming the NTA — the agency that tests 1.2 crore candidates a year with 23 officers.
Sources: the Press Information Bureau release on the Ministry of Statistics and Programme Implementation revising the Consumer Price Index base year from 2012=100 to 2024=100, for the first publication of the new series on 12 February 2026, the item counts rising from 299 to 358 with goods from 259 to 308 and services from 40 to 50, the 1,465 rural and 1,395 urban markets across 434 towns and the 12 online markets; the Ministry’s own Frequently Asked Questions on the CPI 2024 series for the group weights of both series, rural, urban and combined, and for the Household Consumption Expenditure Survey 2023-24 as the source of the weights; the Press Information Bureau release of 15 June 2026 on the new series of the Wholesale Price Index and the Producer Price Indices with base year 2022-23, for the major group weights, the increase from 697 to 957 items, the shift from Net Traded Value to Gross Value of Output, the seven services covered by the Service Producer Price Indices and the trial Input Producer Price Index for manufacturing from March 2026; and the Office of the Economic Adviser’s earlier release for the 2011-12 series weights of 22.62, 13.15 and 64.23 per cent. The Reserve Bank’s inflation target of 4 per cent with a 2 to 6 per cent band is covered in this site’s capsule on the Monetary Policy Committee. Group weights and item counts change at each rebasing, so recheck them against the Ministry’s current release before an exam.
