India's Gross Domestic Product (GDP) estimates undergo revisions not because of an attempt to manipulate growth figures, but rather as statistical agencies incorporate more complete data, updated sources, and improved methodologies, according to former Chief Economic Adviser (CEA) Prof. Krishnamurthy V Subramanian.
Understanding GDP Data Revisions
Prof. Subramanian emphasized that national statistics, by their very nature, rely on estimates and proxies when initial GDP figures are released. This is because complete economic activity data across millions of firms and households is simply unavailable at that early stage. Subsequent estimates then integrate more comprehensive information, leading to revisions.
He cited examples of both upward and downward revisions across different quarters as evidence against any systematic bias. For instance, the April-June 2023 growth was revised downwards from 8.2% to 6.6%, while the July-September 2024 growth saw an upward revision from 5.6% to 7.3%. This pattern, he argued, demonstrates that revisions are a natural part of refining economic data, not a sign of manipulation.
Government Clarifies Key Data Points
The Ministry of Statistics and Programme Implementation (MoSPI) has also issued a detailed clarification addressing concerns surrounding the latest GDP estimates, particularly concerning manufacturing, price deflators, and mining data.
Negative Manufacturing GVA Deflator Explained
MoSPI addressed the observation of a negative manufacturing Gross Value Added (GVA) deflator of 1.5% in Q1 FY27. This, the ministry explained, does not imply a fall in factory-gate prices. It results from the adoption of 'double deflation,' a method where both output and intermediate consumption are deflated separately.
In scenarios where input prices rise faster than output prices, nominal GVA can grow more slowly than real GVA, leading to a negative implicit deflator. The ministry reiterated that a negative inflation in the implicit deflator for manufacturing does not signify a decrease in manufacturing prices.
GDP Inflation vs. CPI and WPI
The ministry further clarified why the implicit GDP inflation rate (2.5%) might differ from consumer inflation (CPI at 3.9%) or wholesale inflation (WPI at over 9%). These measures cover different segments of the economy. The GDP deflator encompasses the broader economy, including consumption, investment, government spending, exports, and services, unlike CPI or WPI which have more specific scopes.
Mining Prices and Real-Nominal GVA Gap
Regarding the significant difference between real and nominal mining GVA, MoSPI attributed this to higher mineral prices. In Q1 FY27, real mining and quarrying GVA declined by 2.4%, while nominal GVA grew by 22.3%. This disparity was primarily driven by sharp increases in crude petroleum, natural gas, and metal ore prices during the quarter.
MoSPI concluded by stating that Q1 estimates remain subject to further revision as more data becomes available, but the direction or magnitude of future revisions cannot be predicted in advance.