Inflation is one of the most closely watched economic indicators in India. Every month, reports mention changes in inflation, but you may also hear two different terms Consumer Price Index (CPI) and Wholesale Price Index (WPI).
At first glance, they may seem similar because both measure price changes. However, they track prices at different stages of the economy and are used for different purposes.
What Is CPI?
The Consumer Price Index (CPI) measures changes in the prices of goods and services that households buy for their daily needs.
In simple words, CPI reflects the cost of living for consumers.
The basket used for CPI includes items such as:
Food
Housing
Fuel and light
Clothing
Healthcare
Education
In India, the National Statistical Office (NSO) under the Ministry of Statistics and Programme Implementation (MoSPI) compiles and publishes CPI data.
What Is WPI?
The Wholesale Price Index (WPI) measures changes in the prices of goods sold at the wholesale level, before they reach consumers.
Instead of tracking retail prices, WPI focuses on the prices manufacturers, producers, and wholesalers pay.
The WPI basket mainly includes:
Primary articles
Fuel and power
Manufactured products
WPI data is published by the Office of the Economic Adviser (OEA) under the Department for Promotion of Industry and Internal Trade (DPIIT), Ministry of Commerce and Industry.
CPI vs WPI Comparison
| Basis | CPI | WPI |
|---|---|---|
| Measures | Retail prices paid by consumers | Wholesale prices of goods |
| Price Level | Consumer level | Wholesale level |
| Coverage | Goods and services | Mainly goods |
| Published By | NSO (MoSPI) | OEA (DPIIT) |
| Main Purpose | Measure consumer inflation and cost of living | Measure wholesale price movements and producer inflation |
Which One Does RBI Focus On?
The Reserve Bank of India (RBI) primarily uses CPI inflation while making monetary policy decisions.
Under India’s inflation-targeting framework, the Monetary Policy Committee (MPC) aims to keep CPI inflation within the target set by the Government of India.
Although WPI is an important economic indicator, it is CPI that serves as the primary measure for RBI’s inflation-targeting policy.
Why Both Matter
Both CPI and WPI provide valuable information about the economy.
Policymakers
Government departments and policymakers use both indicators to understand price trends and support economic decision-making.
Businesses
Businesses monitor WPI to understand changes in input and production costs.
They also track CPI because consumer spending is influenced by retail inflation.
Consumers
CPI directly reflects changes in the prices households pay for everyday goods and services.
It helps people understand how inflation affects their cost of living.
Investors
Investors watch both indices because inflation can influence interest rates, business profits, and economic growth.
Real-Life Example
Imagine international crude oil prices increase.
Oil companies and industries may first experience higher wholesale fuel costs. These changes are reflected in WPI because it measures prices at the wholesale level.
Over time, if transportation and production costs increase, businesses may raise the retail prices of goods such as groceries and household products.
When consumers begin paying higher prices, these increases may be reflected in CPI.
This example shows how changes in wholesale prices can eventually influence retail inflation.
FAQs
What is the difference between CPI and WPI?
CPI measures retail prices paid by consumers, while WPI measures prices of goods sold at the wholesale level.
Who publishes CPI in India?
The National Statistical Office (NSO) under the Ministry of Statistics and Programme Implementation (MoSPI) publishes CPI data.
Who publishes WPI in India?
The Office of the Economic Adviser (OEA) under the Department for Promotion of Industry and Internal Trade (DPIIT) publishes WPI data.
Which inflation measure does RBI use?
The Reserve Bank of India primarily uses CPI inflation for monetary policy and inflation targeting.
Does WPI include services?
No. WPI mainly covers goods, while CPI includes both goods and services consumed by households.
Why are both CPI and WPI important?
CPI helps measure the cost of living for consumers, while WPI helps analyse wholesale price movements, production costs, and inflation trends in the economy.
