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UPSC MainsGeneral Studies Paper IIIIndian EconomyPractice question

Difference Between WPI and CPI in Inflation Targeting

What is the difference between WPI and CPI? Why does RBI use CPI for inflation targeting?

~250 words2 min readmedium
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How to approach

Begin by contrasting the Wholesale Price Index (WPI) and Consumer Price Index (CPI) across structural dimensions such as coverage, commodity basket weights, and compiling agencies. Then, analyse the macroeconomic and welfare rationales behind the Reserve Bank of India adopting CPI over WPI for inflation targeting based on the Urjit Patel Committee recommendations. Conclude by highlighting how CPI targeting aligns monetary policy with consumer welfare.

Model answer

399 words

Introduction

Inflation in India is tracked primarily through two indicators: the Wholesale Price Index (WPI) and the Consumer Price Index (CPI). While WPI captures price changes at the wholesale level before goods reach retail markets, CPI reflects the actual price movements paid by retail consumers. In 2016, India adopted a Flexible Inflation Targeting (FIT) framework under which the Reserve Bank of India formally switched to CPI as its headline nominal anchor.

Key Differences Between WPI and CPI

The two price indices differ fundamentally across coverage, weighting patterns, and publishing authorities:

  • Scope of Coverage: WPI tracks price movements of goods only at the wholesale bulk stage. In contrast, CPI measures retail price changes for both goods and services.
  • Basket Composition and Weights: WPI (697 items) is dominated by Manufactured Products (~64%), followed by Primary Articles (~23%) and Fuel and Power (~13%). Conversely, CPI (358 items) is heavily weighted towards Food and Beverages (~36.5% in the revised series).
  • Nodal Agency and Base Year: WPI (Base Year 2011-12) is released monthly by the Office of the Economic Adviser (DPIIT), Ministry of Commerce and Industry. CPI (Base Year 2024) is compiled and published by the National Statistical Office (NSO), Ministry of Statistics and Programme Implementation.

Why RBI Uses CPI for Inflation Targeting

Following the recommendations of the Urjit Patel Committee (2014), the Reserve Bank of India transitioned from WPI to CPI for monetary policy formulation for the following reasons:

  • Reflects Cost of Living: CPI directly gauges the erosion of purchasing power among retail consumers, providing an accurate indicator of household welfare and living costs.
  • Inclusion of the Services Sector: Services such as education, healthcare, transport, and housing constitute over 50% of India's GDP and form a major component of household expenditure. WPI completely excludes services, making it unrepresentative of broad macroeconomic transactions.
  • Anchoring Inflation Expectations: Public inflation expectations and wage negotiations are formed based on retail price movements rather than wholesale prices. Controlling CPI is essential to anchor public expectations effectively.
  • Determining Real Interest Rates: To protect household savings and encourage domestic financial capital, interest rates must ensure positive real returns against consumer inflation rather than wholesale price indices.

Conclusion

Adopting CPI-based inflation targeting (4% with a tolerance band of ± 2%) brought India's monetary policy in line with international best practices. It ensures that the central bank's policy actions directly reflect and respond to the real economic pressures experienced by households across the country.

Key facts to remember

definition
Consumer Price Index (CPI)

An index that measures changes over time in the retail prices of a representative basket of goods and services consumed by households.

definition
Wholesale Price Index (WPI)

An index that tracks the price of goods traded at the wholesale level and sold in bulk transactions before reaching retail consumers.

statistic

Food and beverages account for approximately 36.5% of the total basket weight in the revised 358-item CPI series.

— National Statistical Office (NSO)

Frequently asked questions

Why did the RBI replace WPI with CPI for monetary policy?

The RBI adopted CPI on the recommendation of the Urjit Patel Committee (2014) because CPI includes the services sector, accurately captures the cost of living for households, and directly anchors public inflation expectations.

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