Inflation is a key macroeconomic concern, and measuring it accurately is vital for policymaking. In India, two primary indices track inflation — the Wholesale Price Index (WPI) and the Consumer Price Index (CPI). While both reflect changes in prices, they differ in scope, methodology, purpose, and coverage.
Definition and Scope:
Data Collection:
Composition Differences:
Hence, even substantial price fluctuations in goods covered by the WPI basket may not immediately impact CPI in the short term. Changes in wholesale prices typically take time to filter through to retail prices, creating a lag effect.Additionally, price movements in non-tradable items that are part of the CPI basket contribute to the divergence between WPI and CPI trends. The differing behaviour of prices in tradable and non-tradable goods is a key factor explaining why the two indices often move differently over short periods
Feature | Wholesale Price Index (WPI) | Consumer Price Index (CPI) |
|---|---|---|
Definition | Measures price changes at the wholesale level | Measures price changes at the retail/consumer level |
Published by | Office of Economic Adviser, DPIIT, Ministry of Commerce & Industry | National Statistical Office (NSO), Ministry of Statistics & Programme Implementation |
Base Year | 2011–12 | 2012 |
Coverage | Covers only goods | Covers both goods and services |
Includes Services? | ❌ No | ✅ Yes |
Weight Distribution | Highest weight to Manufactured Products (64.2%) | Highest weight to Food & Beverages (45.86%) |
Use of Taxes in Pricing | Excludes taxes (closer to Producer Price Index globally) | Includes indirect taxes |
Purpose | Reflects wholesale inflation, helps in early policy interventions | Reflects cost of living and retail inflation that affects consumers |
Price Collection Point | At the wholesale level (first point of bulk sale) | At the retail level (end consumer prices) |
Components | – Primary Articles (22.6%)- Fuel & Power (13.15%)- Manufactured Products (64.2%) | – Food & Beverages (45.86%)- Housing (10.07%)- Miscellaneous (28.32%)and others |
Use in Policy | Used as a deflator in GDP, IIP, etc. | Used by RBI for monetary policy targeting (inflation targeting) |
Frequency of Release | Monthly (with 1-month lag) | Monthly (timely release) |
Scope | Nationwide, All-India WPI | Separate indices for Urban, Rural, and Combined (All India) |
The WPI and CPI serve complementary but distinct roles in India’s inflation monitoring framework. WPI provides early signals at the wholesale level and is used in deflating macroeconomic aggregates like GDP, while CPI, which includes services and reflects actual consumer experiences, forms the basis of monetary policy under the RBI’s inflation targeting mandate
1. Why does RBI use CPI and not WPI for inflation targeting?
Because CPI reflects the actual cost of living and includes services, making it more relevant for monetary policy decisions that affect consumers.
2. Does WPI include services?
No. WPI includes only goods and excludes services, unlike CPI.
3. Which index has a higher weight for food items?
CPI has a higher weight for food and beverages (~45.86%), making it more sensitive to food inflation.
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