Understanding Double Deflation & Implicit GVA deflator

Why in News?
On 31 August 2026, India released an updated series of annual and quarterly GDP estimates with 2022–23 as the base year, incorporating improved price indices and updated administrative data.

Key Points

Revision of Base Year: The base year provides reference prices for calculating real GDP/GVA growth. It is revised periodically to reflect structural changes in the economy and ensure that relative prices remain representative. The latest series uses 2022–23 as the base year.

New Price Indices: The revised series incorporates Output Producer Price Index (PPI) – based on 2022–23; Banking Services Price Index (BSPI) – based on 2022–23; and ppdated administrative and other data sources.

Double Deflation in Manufacturing: Double deflation involves separately removing the effect of price changes from: Output → Real Output;   Intermediate Consumption → Real Intermediate Consumption

Real GVA = Real Output − Real Intermediate Consumption

• It is being adopted for various industries within the manufacturing sector.
• The IMF considers double deflation the preferred method for measuring GDP in volume terms.

What is Deflation?

Deflation in national accounting means removing the effect of price changes from nominal/current-price values to obtain real/constant-price values.

Nominal value → Price adjustment (deflation) → Real value

Understanding the GVA Deflator

A negative GVA deflator does not automatically mean negative or lower real GVA growth.

Real GVA growth depends on the relative movement of real output, and real intermediate consumption. Therefore, a negative implicit GVA deflator should not be interpreted as a simple decline in manufacturing prices.

GDP Deflator vs CPI/WPI

The implicit GDP deflator is broadly GDP Deflator = GDP at Current Prices ÷ GDP at Constant Prices × 100. It covers the entire economy. Hence, the GDP deflator need not move in line with CPI or WPI because they differ in coverage, weights, price concepts and sectoral composition. For example, low inflation in some services and changes in raw-material prices can significantly influence the GDP deflator.

Source: PIB

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