Discuss the significance of rebasing the Consumer Price Index to 2024. How does revision of weights and classification improve the measurement of inflation?

The National Statistics Office (MoSPI) started the CPI series with base 2024=100 on 12 February 2026, replacing the 2012 base. The new series takes its weights from HCES 2023-24 and follows the COICOP 2018 classification [2]. CPI-Combined is the variable behind India's 4% ± 2% inflation target [3], so the change affects both how inflation is measured and how it is managed.

Significance of rebasing

• Monetary policy credibility: the target has been renewed for 2026–31 [3]. A basket that is out of date misreads inflation, and the MPC can then set the wrong repo rate.
• Current consumption patterns: the price survey covers 1,407 urban markets, including online ones, and 1,465 villages [1]. This reflects how households now shop.
• Continuity: a back-series from January 2013 and linking factors keep long-run analysis possible [2].
• Statistical trust: releases come out on a fixed date, the response rate was 100%, and the data is open on eSankhyiki [1].

How revised weights improve measurement

• Weights now come from MMRP-based HCES 2023-24 data [2]. They reflect households' smaller food share and larger services share. Food & beverages now weighs 36.75 [1].
• Each item affects the headline in proportion to its weight. Onion inflation of 116.22% has a weight of only 0.70 [1], so volatile items do not distort the headline.
• Separate rural and urban weights show where the burden falls: rural inflation was 6.63% and urban 5.41% in October 2026 [1].

How revised classification improves measurement

• COICOP 2018 makes India's CPI comparable with other countries' indices [2].
• The basket has 358 items in 12 divisions and 43 groups [2]. This replaces the earlier six broad groups and makes the index more detailed.
• Services now have their own divisions. For example, Restaurants & accommodation inflation was 10.06% [1], which helps the analysis of core inflation.

Limitations

• MoSPI warns that some State-level item indices rest on thin samples [1].
• Rebasing is periodic, so the basket gradually goes out of date between revisions.

The 2024 rebasing makes CPI match current spending more closely, makes it comparable internationally, and makes it more useful for policy. To build on it, the government could rebase on a shorter, regular cycle, use larger State-level samples, and bring wholesale price measures in line with CPI. These steps would strengthen evidence-based, flexible inflation targeting under Section 45ZA of the RBI Act.