When inflation is discussed in India, most people hear about the Consumer Price Index (CPI). However, there is another important indicator that economists, businesses, and policymakers closely monitor the Wholesale Price Index (WPI).
Unlike CPI, which tracks prices paid by consumers, WPI measures price changes at the wholesale level. It helps understand how the prices of goods are changing before they reach retail markets.
What Is WPI?
The Wholesale Price Index (WPI) measures the average change in the prices of goods sold in bulk (wholesale) before they reach consumers.
In simple words, WPI tracks the prices that wholesalers and businesses pay for goods rather than the prices consumers pay in shops.
According to the Office of the Economic Adviser (OEA), Department for Promotion of Industry and Internal Trade (DPIIT), WPI measures changes in wholesale prices of selected goods over time.
Wholesale Prices vs Retail Prices
Wholesale prices are the prices at which manufacturers or producers sell goods in bulk to wholesalers or businesses.
Retail prices are the prices consumers pay when purchasing goods from shops or online stores.
Because of this difference, WPI and CPI may not always move in the same direction.
How Is WPI Calculated?
WPI is calculated by monitoring the prices of a fixed basket of goods at the wholesale level.
The basic process includes:
Selecting a basket of representative goods.
Collecting wholesale price data regularly.
Comparing current prices with prices in the base year.
Combining the price changes using assigned weights to calculate the overall index.
The methodology is designed to measure changes in wholesale prices across different sectors of the economy.
What Does WPI Include?
The WPI basket mainly includes goods produced and traded within the economy.
The major groups are:
Primary Articles
These include products such as:
Food articles
Non-food articles
Minerals
Fuel and Power
This category includes items such as:
Coal
Mineral oils
Electricity
Since fuel is an important input for many industries, changes in this category can affect production costs.
Manufactured Products
This is the largest component of WPI and includes manufactured goods such as:
Steel
Cement
Chemicals
Machinery
Textiles
Food products
WPI vs CPI
| Basis | Wholesale Price Index (WPI) | Consumer Price Index (CPI) |
|---|---|---|
| Level of Measurement | Wholesale prices | Retail prices paid by consumers |
| Purpose | Measures price changes for goods at the wholesale level | Measures changes in the cost of living for consumers |
| Coverage | Primarily goods | Goods and services purchased by households |
| Typical Use | Business cost analysis, manufacturing trends, inflation analysis | Consumer inflation measurement and monetary policy |
Why WPI Matters
Business Costs
Businesses use WPI to understand changes in input costs.
Higher wholesale prices may increase production expenses.
Manufacturing Trends
Since WPI covers manufactured products, it helps track pricing trends in the industrial sector.
Inflation Analysis
Economists compare WPI and CPI to better understand inflation at different stages of the supply chain.
Policy Discussions
Although the Reserve Bank of India uses CPI as the primary measure for inflation targeting, WPI remains an important indicator for analysing producer prices and broader economic trends.
Real-Life Example
Imagine that the wholesale price of steel increases because raw material costs rise.
Manufacturers purchasing steel may face higher production costs.
Similarly, if wholesale fuel prices increase, transportation and manufacturing expenses may also rise.
Businesses may eventually pass some of these higher costs to consumers through increased retail prices.
This is one reason economists monitor WPI along with CPI when analysing inflation trends.
FAQs
What is Wholesale Price Index (WPI)?
WPI measures changes in the prices of goods sold at the wholesale level before they reach consumers.
Who publishes WPI in India?
The Office of the Economic Adviser (OEA) under the Department for Promotion of Industry and Internal Trade (DPIIT), Ministry of Commerce and Industry publishes WPI data.
What is the difference between WPI and CPI?
WPI measures wholesale prices of goods, while CPI measures retail prices paid by consumers for goods and services.
What items are included in WPI?
WPI includes primary articles, fuel and power, and manufactured products.
Why is WPI important?
It helps analyse wholesale inflation, business costs, manufacturing trends, and price movements across the economy.
Does RBI use WPI for inflation targeting?
The Reserve Bank of India primarily uses CPI for its inflation-targeting framework, while WPI remains an important indicator for analysing wholesale price movements.
