On 2 June 2026, the government approved revising the base year of the Wholesale Price Index (WPI) from 2011-12 to 2022-23 and introducing new Producer Price Indices (PPIs). The revised series will be released by the Office of the Economic Adviser, DPIIT on 15 June 2026. For CDS and NDA aspirants, this is a high-yield economy item on how India measures inflation — a topic that appears in almost every cycle.
What was announced
- The WPI base year moves from 2011-12 → 2022-23, with expanded coverage, inclusion of renewable energy, and improved methodology.
- New Producer Price Indices will be introduced — an Output PPI (OPPI), a trial Input PPI (IPPI), and a Services PPI for seven services (banking, securities, insurance, pension-fund management, railways, etc.).
- The revision was approved after vetting by the Technical Advisory Committee on Statistics of Prices and Cost of Living and the National Statistical Commission (NSC), and the revised series will be released by the Office of the Economic Adviser, DPIIT.
What is inflation, and why measure it?
Inflation is the sustained rise in the general price level of goods and services over time, which erodes the purchasing power of money. Measuring it accurately is vital because inflation data guides monetary policy (the RBI), wage and pension indexation, and government decisions. India uses several price indices, each measuring inflation from a different angle.
Wholesale Price Index (WPI)
The WPI measures the average change in the prices of goods at the wholesale (bulk) level — before they reach the retail consumer. Key facts:
- It is compiled by the Office of the Economic Adviser, DPIIT, Ministry of Commerce & Industry.
- It covers only goods (no services), grouped into three major heads: Primary Articles, Fuel & Power, and Manufactured Products.
- Because it tracks wholesale/producer-side prices, WPI is useful for understanding price pressures in the production chain.
Consumer Price Index (CPI)
The CPI measures the change in retail prices paid by consumers for a basket of goods and services:
- It is compiled by the National Statistical Office (NSO) under MoSPI.
- It includes services (like education, health, transport) and reflects the cost of living.
- Crucially, CPI is the RBI's main inflation anchor under the inflation-targeting framework, which mandates keeping CPI inflation at 4% (±2%).
Producer Price Index (PPI)
A PPI measures price changes from the producer's / seller's perspective at the point of first sale, and — unlike WPI — can also cover services. Most major economies use a PPI rather than (or alongside) a WPI, so India's move to introduce one brings it closer to global best practice and provides a better measure of producer-side and services inflation.
Why revise the base year?
The base year is the reference year (index = 100) against which price changes are measured. It must be periodically updated so that the basket of goods and the weights reflect current production and consumption patterns. Moving from 2011-12 to 2022-23 — and adding items like renewable energy — ensures the index mirrors today's economy. An outdated base year distorts inflation readings and misguides policy.
Why it matters
- Accuracy: a 2022-23 base captures the current economy far better than the 2011-12 base.
- Better statistics: introducing a PPI (including services) aligns India with international practice.
- Policy: reliable price indices guide monetary policy, indexation and government planning.
Inflation and monetary policy
Price indices feed directly into monetary policy. Under India's flexible inflation-targeting framework (adopted in 2016), the Reserve Bank of India (RBI) is mandated to keep CPI inflation at 4%, within a band of ±2% (i.e., 2–6%). Decisions are taken by the Monetary Policy Committee (MPC) — a six-member body (three from the RBI, three appointed by the government) chaired by the RBI Governor. To control inflation, the RBI adjusts the policy repo rate (the rate at which it lends to banks): raising rates cools demand and inflation, while cutting rates supports growth. Accurate, up-to-date price indices like the revised WPI/CPI are therefore essential inputs to these decisions.
Types of inflation
Aspirants should know the main categories:
- Demand-pull inflation — when demand outstrips supply (too much money chasing too few goods).
- Cost-push inflation — when rising input costs (wages, fuel, raw materials) push prices up.
- Headline vs core inflation — headline includes all items; core excludes volatile food and fuel, showing the underlying trend.
- Other terms: deflation (falling prices), disinflation (a slowing rate of inflation), and stagflation (high inflation with stagnant growth).
Different indices capture different slices of inflation — which is exactly why India maintains WPI, CPI, the new PPI and the GDP deflator together, and periodically updates their base years to keep them accurate.
Key facts for your exam
- WPI base year: 2011-12 → 2022-23; revised series out 15 June 2026.
- WPI compiled by the Office of the Economic Adviser, DPIIT (Commerce & Industry); covers goods only; heads = Primary Articles, Fuel & Power, Manufactured Products.
- CPI compiled by NSO/MoSPI; it is the RBI's inflation target (4% ±2%).
- PPI measures prices from the producer's side and can include services.
- GDP deflator is the broadest inflation measure (covers all goods and services in GDP).
Quick revision recap
- WPI base year: 2011-12 → 2022-23; revised series + new PPIs out 15 June 2026.
- WPI: wholesale goods only; by Office of the Economic Adviser, DPIIT; heads = Primary Articles, Fuel & Power, Manufactured Products.
- CPI: retail, includes services; by NSO/MoSPI; the RBI's inflation target (4% ±2%).
- PPI: producer-side prices, can include services — new for India.
- GDP deflator: broadest inflation measure (all goods + services in GDP).
- MPC (6 members, chaired by RBI Governor) sets the repo rate to manage inflation.
- Types: demand-pull, cost-push; headline vs core; deflation, disinflation, stagflation.
Why accurate price data matters
Reliable inflation data is not an academic exercise — it directly affects citizens. Inflation indices are used to revise Dearness Allowance (DA) for government employees and pensioners, to index wages and welfare payments, to set minimum support prices and to guide the RBI's interest-rate decisions that influence loan EMIs and savings returns. A base-year revision that better reflects today's consumption — including digital services and renewable energy — makes all these decisions more accurate and fair. This is why statisticians periodically update the base year and methodology, and why India is adding a modern Producer Price Index in line with global practice.
Previous-year & expected exam questions
Q1. The Wholesale Price Index (WPI) in India is compiled by — Answer: The Office of the Economic Adviser, DPIIT, Ministry of Commerce & Industry.
Q2. Which index does the RBI primarily target for monetary policy — WPI or CPI? Answer: CPI (Consumer Price Index) — under the inflation-targeting framework (4% ±2%).
Q3. The three major groups of the WPI are — Answer: Primary Articles, Fuel & Power, and Manufactured Products.
Q4. A Producer Price Index (PPI) differs from WPI mainly because it — Answer: Measures prices from the producer's perspective and can include services, not just goods.
Q5. The Monetary Policy Committee (MPC) is chaired by — Answer: The Governor of the Reserve Bank of India.
Q6. "Core inflation" excludes which volatile components? Answer: Food and fuel.
Q7. A situation of high inflation combined with stagnant growth is called — Answer: Stagflation.
Putting it together
India is unusual in publishing several inflation measures, each serving a purpose: the CPI guides the RBI's inflation target and reflects the cost of living; the WPI captures wholesale/producer-side price pressure in goods; the new PPI will measure producer prices including services; and the GDP deflator gives the broadest economy-wide picture. Keeping these indices accurate and up to date — through periodic base-year revisions and methodology upgrades — ensures that policymakers, businesses and citizens are reading the economy correctly. The 2022-23 WPI revision and the introduction of a PPI are therefore quiet but important steps in modernising India's statistical system, which underpins sound economic policymaking.
FAQ
Q1. What is the difference between WPI and CPI? WPI tracks wholesale (bulk) prices of goods; CPI tracks retail prices paid by consumers (including services). CPI better reflects the cost of living and is the RBI's anchor.
Q2. What is a Producer Price Index (PPI)? A measure of price change from the seller's/producer's perspective at the point of first sale. Unlike WPI, it can also cover services, which is why India is introducing one.
Q3. Why revise the base year at all? To keep the index representative — updating the basket of goods/services and weights to reflect the current structure of the economy, including new items like renewable energy.
Q4. Which is the broadest measure of inflation? The GDP deflator, because it covers all goods and services produced in the economy, unlike CPI (consumer basket) or WPI (wholesale goods only).