India's GDP Measurement Challenges and Revisions
Introduction
The accuracy of India’s Gross Domestic Product (GDP) as a reflection of its economic reality has been a subject of debate among economists. Recent revisions to the national accounts methodology aim to enhance GDP estimation by addressing issues such as deflator choices, informal sector treatment, and the use of administrative data.
Critique by Anand, Felman, and Subramanian
- Their paper, published in March 2026, argues there is systematic misestimation of GDP.
- Key criticisms include:
- Use of Wholesale Price Index (WPI) as deflators rather than Consumer Price Index (CPI).
- Reliance on formal-sector corporate data to represent informal-sector activity.
- These critiques are not new and have been discussed since at least 2016.
Deflator and Informal Sector Issues
- WPI is similar to a Producer Price Index, making it internationally acceptable.
- CPI is more relevant to private consumption and does not include industrial goods like steel and cement.
- The paper's estimation of the informal sector is criticized for:
- Excluding significant sectors like construction and housing services.
- Using corporate sales data, which measures turnover, not value added, leading to potential misestimations.
Methodological Considerations
- The paper fails to address the economic changes post-2015, such as:
- Expansion of the digital economy.
- Growth in financial services and insurance.
- India's emergence as a hub for Global Capability Centres.
- Indicators like energy consumption and trade volumes may not fully capture these changes.
Rebuttal to Mismeasurement Argument
- The 2017-18 Economic Survey found that informal firms accounted for only about 7% of economic turnover despite being 87% of firms by number.
- The paper's assumption that the informal sector accounts for 44% of GVA is undermined by evidence of formalisation.
- Formal sector’s share was around 80% of total turnover by late 2017.
Official Methodology Revision
- The 2026 revision, based on comprehensive administrative data, suggests less overestimation than claimed by the paper.
- If overestimation were as high as claimed (22%), the official revision would reflect this significantly, which it does not.
Conclusion
The paper by Anand, Felman, and Subramanian raises important questions but does not adequately consider changes in the Indian economy and methodological robustness of recent revisions. The official revisions, derived from extensive data and consultation, provide a more accurate picture of GDP estimation.
