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Understanding the New Inflation Index Methodology
SYNOPSIS
India has revised its Consumer Price Index (CPI) with a new base year of 2024, replacing the earlier 2012 framework to better reflect current consumption patterns. The updated methodology captures shifts in spending, including higher weight for services and reduced weight for food, using recent Household Consumption data and improved price collection methods. Initial estimates show inflation at around 3.4 % for March 2026, with minor rural-urban variation. This more accurate measurement enhances the ability of the Reserve Bank of India to frame effective monetary policy under its inflation-targeting framework. Overall, the revised CPI improves decision-making for policymakers and investors by providing a clearer view of real inflation dynamics.
While inflation is more than just a statistical indicator, it has a direct impact on borrowing rates, investment, salaries and market sentiment. Yet, the reliability of inflation data and figures depends greatly on the methodology adopted to compute them. In the case of India, a major methodological overhaul in the computation of the Consumer Price Index (CPI) is changing the existing narrative.
The Ministry of Statistics and Programme Implementation (MoSPI) has released a revised Consumer Price Index, which has a new base year of 2024. This replaces the previous base year of 2012. The revised index aims to provide a more accurate representation of the changing dynamics of the economy. The initial results based on the revised methodology have shown an inflation rate of 3.4% in March 2026. The inflation rate varies slightly between urban and rural areas, standing at 3.63% and 3.11%, respectively.
The decision to revise the existing methodology came in response to the changing dynamics of the Indian economy. The country has witnessed substantial economic growth in the last decade, which has resulted in an increase in disposable incomes. The rise in disposable incomes, combined with increasing urbanization and the use of technology, has had a major impact on the consumption patterns of the population. The existing CPI, which was based on old data, could not capture the increasing importance of services like healthcare, education, housing, transportation and internet connectivity.
The revised CPI, based on the latest available data from the Household Consumption Expenditure Survey (2023-24), has taken into consideration a more comprehensive and representative consumption pattern. It has used more advanced techniques to collect data, which include the collection of prices from both physical and online markets.
Significantly, in this new series, there has been a shift in weightage distribution in the CPI basket. The weightage of food items has been lowered to 36.75%, which reflects a decline in their percentage in household expenditure. On the other hand, weightage distribution for other items has increased, which is a step in line with changing consumption habits.
From a policy perspective, measurement of inflation is a sine qua non. The Reserve Bank of India, which follows an inflation-targeting model of 4% ± 2%, depends on CPI data to frame its monetary policy. More accurate data would help RBI take a more informed decision on raising or lowering interest rates, which would strike a balance between growth and inflation.
The implications of a more accurate inflation measurement are significant, not just for policymakers but also for other stakeholders. More accurate data would help investors take a more informed view on the real rate of return on their investments, especially on stocks and fixed deposits.
Inflation, in a broader sense, is not merely a movement in prices but a measurement of its accuracy.
Inflation measurement in India has become more accurate with a change in its Consumer Price Index framework, which would have a significant bearing on its policy and market implications.
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