Ministry of Statistics & Programme Implementation has strengthened the measurement framework of the Consumer Price Index (CPI) through a comprehensive base revision from 2012=100 to 2024=100

1. At a Glance

• MoSPI has shifted the Consumer Price Index (CPI) base year from 2012=100 to 2024=100, using HCES 2023–24 to refresh the item basket and weights [1][2].
• Adopts COICOP 2018 (UN classification), expands the item basket, and inducts administrative & e-commerce data for the first time [1][3].
• Important for GS-III (Indian Economy — inflation, statistics) and Prelims factual cells (base year, weights, classification).

2. Why in the News

• PIB release dated 23 March 2026 announced the strengthened CPI measurement framework on the new 2024=100 base [1].
• First press release of CPI on base 2024=100 issued by MoSPI in early 2026; March 2026 CPI release was the first regular monthly bulletin on the new base [2][4].

3. Background & Evolution

• CPI in India historically compiled in segmented series — CPI-IW, CPI-AL, CPI-RL (by Labour Bureau) and a general CPI (Rural/Urban/Combined) by CSO/MoSPI.
• 2011: MoSPI launched CPI (Rural, Urban, Combined) with base 2010=100; revised to base 2012=100 in 2015 using NSSO CES 2011–12 weights [2].
• RBI adopted CPI-Combined as the nominal anchor for Flexible Inflation Targeting (FIT) under the RBI Act amendment, 2016 (target 4% ±2%).
• 2022: MoSPI constituted an Expert Group on Comprehensive Updation of CPI chaired by Prof. Rajeeva Laxman Karandikar (Chairman, National Statistical Commission) [3][5].
• 2024–25: Release of HCES 2023–24 results — first consumption survey since 2011–12 — enabled weight refresh [1].
• 2026: Rollout of CPI 2024=100.

4. Core Static Facts

• Implementing body: National Statistical Office (NSO), Ministry of Statistics & Programme Implementation (MoSPI) [1].
• Source of weights: Household Consumption Expenditure Survey (HCES) 2023–24 [1][2].
• Classification: COICOP 2018 (Classification of Individual Consumption According to Purpose) — UN Statistics Division standard [2].
• Hierarchy in CPI 2024: 12 Divisions → 43 Groups → 92 Classes → 162 Sub-classes → 358 weighted items [2].
• Item basket expansion: From 299 items (2012 series) to 358 items (2024 series) — goods 259→308, services 40→50 [2].
• New data inputs: Administrative data and e-commerce/online platform price data integrated for the first time [1].
• E-commerce expenditure share (HCES 2023–24): 4.0% rural, 10.5% urban [2].
• Food & Beverages: Share has declined in the new series but remains the largest component [2].
• Expert Group Chair: Prof. Rajeeva Laxman Karandikar [3][5].
• First regular monthly release on new base: March 2026 CPI [4].

5. Multi-Dimensional Analysis

Economic

• A more representative basket reduces measurement bias in headline CPI, sharpening RBI's MPC decisions under the FIT framework [2].
• A lower food share reflects Engel's Law at work — rising incomes shrink food's share — and is likely to dampen volatility in headline inflation [2].
• Updated weights affect DA/DR indexation, wage negotiations, real interest rate computation, and GDP deflation.

Administrative / Statistical

• Shift to COICOP 2018 aligns India with OECD/UN international comparability benchmarks [2].
• Inclusion of e-commerce scanner data modernises price collection beyond the traditional retail outlet visits by NSO field staff [1].
• Closes a 13-year gap since the last consumption survey (CES 2011–12) [1].

Governance / Credibility

• Addresses long-standing critique by economists (e.g., obsolete weights post-2017 GST and post-pandemic shifts).
• The Karandikar Expert Group institutionalises periodic basket review, improving statistical transparency [3].

Technological

• Use of web-scraped/scanner data from e-commerce introduces high-frequency, large-volume price inputs — analogous to Billion Prices Project-type methods.

6. Recent Developments (last 12–18 months)

• 2024–25: HCES 2023–24 fact-sheet and unit-level data released by MoSPI [1].
• Jan 2026: MoSPI released Expert Group Report on Comprehensive Updation of CPI [5].
• Feb 2026: First press release on new base 2024=100 issued [2].
• 23 Mar 2026: PIB release detailing the strengthened framework [1].
• Mar 2026: First regular monthly CPI bulletin on base 2024=100 [4].

7. Prelims Hooks

• Base year revised from 2012=100 → 2024=100 [1].
• Weights based on HCES 2023–24, not NSSO CES 2011–12 [1].
• Classification standard adopted: COICOP 2018 of the UN Statistics Division [2].
• CPI 2024 structure: 12 Divisions, 43 Groups, 92 Classes, 162 Sub-classes, 358 items [2].
• Weighted items rose from 299 → 358; services from 40 → 50 [2].
• Implementing ministry: MoSPI (NSO arm), not RBI or Labour Bureau [1].
• Expert Group on CPI Updation chaired by Prof. Rajeeva L. Karandikar, Chairman, National Statistical Commission [3].
• Online-platform share of household expenditure (HCES 2023–24): Rural 4.0%, Urban 10.5% [2].
• Food & Beverages remains largest CPI component despite a declining share [2].
• Administrative data + e-commerce data newly inducted into CPI compilation [1].
• RBI's inflation-targeting anchor is CPI-Combined, target 4% ± 2% (per RBI Act, 2016 amendment).
• CPI-IW, CPI-AL, CPI-RL are compiled by Labour Bureau (Ministry of Labour), distinct from MoSPI's CPI [general knowledge].

8. Mains Relevance

• GS-III: Indian Economy — Growth, Development; Inclusive Growth; Government Budgeting — specifically inflation measurement, monetary policy transmission, indexation of welfare entitlements.
• GS-II: Statutory bodies — National Statistical Commission's role.

Plausible question stems:

1. "The revision of the CPI base from 2012 to 2024 is more than a technical update — it is a recalibration of India's macroeconomic compass." Examine.
2. Discuss how the integration of e-commerce and administrative data into CPI compilation strengthens the credibility of India's inflation statistics. What challenges remain?
3. Evaluate the implications of a declining share of food in the CPI basket for monetary policy under the Flexible Inflation Targeting framework.

9. Related Topics to Study Next

• HCES 2022–23 & 2023–24 — provides the consumption weights and poverty estimate revisions.
• Flexible Inflation Targeting (FIT) & MPC — direct user of CPI-Combined.
• WPI revision (base 2011–12) and proposed shift to Producer Price Index (PPI) — Ramesh Chand Committee.
• National Statistical Commission (NSC) — Rangarajan recommendation; reform debates.
• GDP base year revision to 2022–23/2024–25 — parallel statistical modernisation.
• COICOP 2018 & SNA 2025 — UN classification frameworks.
• CPI-IW base revision to 2016=100 by Labour Bureau — distinguishing series.
• Engel's Law and structural transformation — economic interpretation of falling food share.

10. Common Errors / Trap Areas

• Confusing CPI (MoSPI) with CPI-IW (Labour Bureau) — different bases, different uses (CPI-IW base 2016=100).
• Assuming RBI compiles CPI — RBI only uses it; MoSPI compiles it.
• Mixing up HCES 2023–24 (CPI weights) with NSSO CES 2011–12 (previous weights basis).
• Writing "COICOP 1999" — the adopted version is COICOP 2018.
• Stating food share has been removed/halved — it has only declined; it still remains the largest component.
• Citing wrong item count — new basket has 358 items, not 299 (old) or 460 (CPI-IW).