Understanding Price Indices in India – CPI, WPI, GDP Deflator, PPI
Price indices are critical tools used to measure inflation and assess the overall price level in an economy. In India, several indices like the Consumer Price Index (CPI), Wholesale Price Index (WPI)and the GDP Deflator help track changes in the prices of goods and services over time. These indices are crucial for policymakers, businesses, and the general public to understand economic trends, adjust incomes, and take informed decisions
Price indices in India
- WPI- It is compiled and released on monthly basis by the Office of Economic Adviser, Department of Industrial Policy and Promotion (DIPP), Ministry of Commerce & Industry.WPI is also compiled by many states covering state level wholesale transactions.
- CPI (Urban, Rural and All India)– It is released by National Statistical Office (NSO), Ministry of Statistics & Programme Implementation (MoSPI);
- CPI (Industrial Workers), CPI (Agricultural Labour) and CPI (Rural Labour) are a set of Indices released by the Labour Bureau, Ministry of Labour. Some States also compile variants of CPI and WPI indices at the State level.
GDP Deflator
- The GDP deflator, also called implicit price deflator, is a measure of inflation. It is the ratio of the value of goods and services an economy produces in a particular year at current prices to that of prices that prevailed during the base year.
- The GDP deflator is the most comprehensive measure of inflation as the deflator covers the entire range of goods and services produced in the economy — as against the limited commodity baskets for the wholesale or consumer price indices
- This ratio helps show the extent to which the increase in gross domestic product has happened on account of higher prices rather than increase in output.
- GDP deflator is available only on a quarterly basis along with GDP estimates, whereas CPI and WPI data are released every month.
- What it Measures:
- It captures the change in prices of all domestically produced final goods and services within an economy.
- Why It’s Useful:
- Unlike other indices (like the Consumer Price Index), the GDP deflator:
- Does not rely on a fixed basket of goods and services.
- Reflects price changes across the entire spectrum of production, adapting automatically as the composition of GDP evolves.
- Limitations:
- Although it offers the broadest view of inflation, the GDP deflator is not used for short-term policy decisions because the data is published with a long time lag.
- GDP Price Deflator = (Nominal GDP ÷ Real GDP) × 100
- Nominal GDP: Calculated at current prices, without adjusting for inflation.
- Real GDP: Adjusted for inflation, representing the actual output.
Wholesale Price Index (WPI)
- WPI measures inflation at the wholesale transactions level for the entire economy.
- It helps the Government intervene early to check price rises, especially in essential commodities, before wholesale inflation spills over to retail prices.
- WPI is used as a deflator for nominal macroeconomic aggregates like GDP and IIP.
- Publication and Coverage
- Published by the Office of the Economic Adviser, Department for Promotion of Industry and Internal Trade, Union Ministry of Commerce & Industry.
- Released with a one-month lag.
- Has an All-India character, representing nationwide price trends.
- Composition of Basket: Comprises 697 items including 117 items for Primary Articles, 16 items for Fuel & Power and 564 items for Manufactured Products.
- Primary Articles (Weight: 22.618 out of 100): Consists of 4 sub-groups: Food Articles; Non-Food Articles; Minerals; and Crude petroleum and natural gas.
- Fuel and Power (Lowest weight: 13.152 out of 100): Consists of 3 sub-groups: Coal; Mineral Oils; Electricity.
- Manufactured Products (Highest weight: 64.230 out of 100): Consists of 22 sub-groups.
- Methodology
- Inflation is calculated on a point-to-point basis:
- Compares prices in a specific month with prices in the same month of the previous year to account for seasonality.
- Base Year : 2011-12
- The Wholesale Price Index (WPI) serves several important purposes:
- It provides estimates of inflation at the wholesale level for the entire economy, enabling the government to take timely measures to control rising prices, especially for essential commodities, before these increases affect retail markets.
- WPI is used by the Central Statistical Office (CSO) as a deflator to adjust nominal values in various sectors, including the estimation of GDP.
- Businesses use WPI for indexation in contracts, ensuring payments reflect changes in price levels over time.
- Global investors monitor WPI as a key macroeconomic indicator to inform their investment decisions.
- The Wholesale Price Index (WPI) in India has been revised seven times—in 1952–53, 1961–62, 1970–71, 1981–82, 1993–94, 2004–05 and 2011-12. On 12 May 2017, the base year was updated from 2004–05 to 2011–12 to bring it in line with the base years of other key macroeconomic indicators, such as Gross Domestic Product (GDP) and the Index of Industrial Production (IIP).
- Wholesale price index calculated with 2011-12 base year does not include taxes in order to remove the impact of fiscal policy.This also brings the present WPI series closer to Producer Price Index, as is practised globally.
Producer Price Index (PPI)
- PPI measures the average change in the price a producer receives for his goods/services sold in the domestic market/exports either as they leave the place of production called Output PPI or as they enter the production process called Input PPI.
PPI vs WPI – Key Differences
- Coverage and Price Basis
- WPI : WPI captures the price changes at the point of bulk transactions and may include some taxes levied and distribution costs up to the stage of wholesale transactions.
- PPI : It measures the average price changes received by domestic producers for their goods and services.
- Weighting Method
- Weight of an item in WPI is based on net traded value whereas in PPI weights are derived from Supply Use Table
- Counting Bias
- WPI: Subject to multiple counting bias.
- PPI: Eliminates multiple counting, ensuring cleaner measurement.
- Coverage of Services
- WPI: Excludes services.
- PPI: Includes services, offering a broader coverage of the economy.
PPI vs CPI – Key Differences
- Perspective and Purpose
- PPI: Measures average price changes received by producers (factory-gate prices).
- CPI: Measures average price changes paid by consumers (retail prices).
- Components of Price
- PPI: Excludes elements like taxes, distribution, trade, and transport margins.
- CPI: Includes all these costs, reflecting the final price consumers pay.
- Weighting Method
- PPI: Weights of items derived from Supply Use Tables, based on production structure.
- CPI: Weights of items derived from Consumer Expenditure Surveys, based on household spending patterns.
Note: Supply and use tables or in short supply use tables are in the form of matrices that record how supplies of different kinds of goods and services originate from domestic industries and imports and how those supplies are allocated between various intermediate or final uses, including exports.
CPI for Industrial workers / CPI (IW)
- CPI (IW) tracks price changes for industrial workers.
- Base Year: 2016
- The new series of Consumer Price Index for Industrial Workers (CPI- IW) on base 2016 =100 has been effective from September, 2020.
- The CPI (IW) indices are mainly used for regulation of Dearness allowance and Wages of millions of Workers and Employees belonging to Central Government, State Governments, Public and Private sector Establishments in the country.
- Published by : The Labour Bureau has been compiling and maintaining the Consumer Price Index for Industrial Workers since 1944.
CPI for Agricultural Labourers CPI (AL)
- The coverage of CPI-AL is confined to households of agricultural labourers.
- Published by : The Labour Bureau
- The index is released on a monthly basis and the Index of the previous month is released on the 20th of the ongoing month.
- Covers data from from 600 sample villages selected from 20 States every month.
- Method of collection:
- The Field Operations Division of the National Statistical Office has been entrusted with the responsibility of collection of rural retail prices every month from shops and markets catering to 600 representative sample villages spread over 66 NSS regions in 20 States. Price collection from these sample villages is staggered over the four weeks of a month, with one-fourth of the sample being covered every week. These prices are collected on the fixed price collection day which may be a “Haat” day for non-daily markets and any market day for daily markets. The price returns are scrutinised and processed in Labour Bureau and the discrepancies, if any, are sorted out through correspondence and field inspections by the staff of the Bureau.
CPI for Rural Labourers / CPI (RL)
- CPI (RL) measures the changes in the cost of living for rural laborers.
- Published by : The Labour Bureau
- The index is released on a monthly basis and the Index of the previous month is released on the 20th of the ongoing month.
- Covers data from 600 sample villages selected from 20 States every month.
- Method of collection:
- The Field Operations Division of the National Statistical Office has been entrusted with the responsibility of collection of rural retail prices every month from shops and markets catering to 600 representative sample villages spread over 66 NSS regions in 20 States. Price collection from these sample villages is staggered over the four weeks of a month, with one-fourth of the sample being covered every week. These prices are collected on the fixed price collection day which may be a “Haat” day for non-daily markets and any market day for daily markets. The price returns are scrutinised and processed in Labour Bureau and the discrepancies, if any, are sorted out through correspondence and field inspections by the staff of the Bureau.
CPI
- A consumer price index (CPI) measures changes over time in the general level of prices of goods and services that households acquire for the purpose of consumption.
Features:
- Includes both goods and services.
- Published by National Statistical Office, MoSPI
- Base year : 2012
- Components along with their weightage:
- Food and Beverage – 45.86
- Housing – 10.07
- Fuel and Light – 6.84
- Clothing and Footwear – 6.53
- Pan, tobacco, and intoxicants – 2.38
- Miscellaneous – 28.32
- The weights of the CPI basket are based on the average household expenditure taken from the Consumer expenditure survey.
- Includes indirect taxes
- The CPI measures price changes by comparing, on a point to point basis, the cost of a fixed basket of commodities like the WPI.
- Method of collection:Monthly price data are collected from 1181 villages and 1114 markets in 310 selected towns by the Field Operations Division of NSSO and the specified State/UT Directorates of Economics and Statistics. The prices are being collected through Web Portals.
Consumer Food Price Index (CFPI)
- The Consumer Food Price Index (CFPI) is a measure of change in retail prices of food items consumed by the population.
- It is a specific measure of inflation that focuses exclusively on the price changes of food items in a consumer’s basket of goods and services.
- The CFPI is a sub-component of the broader Consumer Price Index (CPI).
- The Central Statistics Office (CSO) under the Ministry of Statistics and Programme Implementation (MOSPI) began publishing the Consumer Food Price Index (CFPI) separately for rural, urban, and combined categories across India starting from May 2014.
- Methodology: Like the Consumer Price Index (CPI), the CFPI is also calculated monthly and the methodology remains the same as the CPI.
- Base year : 2012
Price indices like the Consumer Price Index (CPI), Wholesale Price Index (WPI), and the GDP Deflator play a pivotal role in tracking inflation, guiding fiscal and monetary policy, and adjusting income levels such as wages and pensions. CPI reflects changes in the cost of living for consumers, while WPI captures inflation at the wholesale level. The GDP deflator, being the most comprehensive, measures price changes across the entire economy.
FAQs
Q1. What is the difference between CPI and WPI?
A: CPI measures inflation at the retail level from the consumer’s perspective and includes taxes and distribution costs. WPI measures inflation at the wholesale level and excludes services.
Q2. Why is the GDP deflator called the most comprehensive inflation indicator?
A: Because it covers all final goods and services produced domestically, unlike CPI and WPI which are based on fixed baskets.
Q3. Who publishes CPI in India?
A: The National Statistical Office (NSO), Ministry of Statistics and Programme Implementation (MoSPI), publishes CPI (Rural, Urban, Combined).
Q4. What is the base year for WPI in India?
A: The current base year for WPI is 2011–12.
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