Whalesbook
Data Accuracy Questioned
Accurate economic data is crucial for forecasting. India's recently updated National Accounts Statistics (NAS) series, with a 2022-23 base year, faces a key challenge: it heavily relies on the Wholesale Price Index (WPI) for over half of its calculations. The WPI uses a fixed basket of goods and a 2011-12 base year, making it increasingly detached from current price realities. This disconnect can distort the measurement of real economic growth and obscure inflationary pressures.
Outdated WPI Fails to Keep Pace
Around the world, statistical agencies prioritize up-to-date price gauges. While many countries use GDP deflators with different base years, there's a global trend toward more frequent updates and using Producer Price Indices (PPIs), which offer a more detailed view of price changes at the producer level. The U.S., for example, switched from a WPI to a PPI in 1978 because the PPI better covers industries and signals consumer price shifts. India's current WPI, with its 2011-12 base, cannot reflect changes in production, consumption, or technology. This can lead to understating growth rates. Data from 2015-16 onwards shows the GDP deflator often differed from the WPI, suggesting inflation was underestimated for key areas like capital and consumer goods. In recent data for April-February 2025-26, many WPI items showed little to no inflation despite broader economic pressures.
Policy and Investment Risks Rise
Precise price deflators are vital for central banks and policymakers. Institutions like the U.S. Federal Reserve and the European Central Bank use inflation and GDP deflator data to guide monetary policy, such as setting interest rates. An inaccurate deflator can lead to poor policy choices. If real GDP growth is overstated because inflation is underestimated, policymakers might delay necessary interest rate hikes or misinterpret slowing nominal growth as a contraction when inflation is just moderating. This can also lead to misallocated capital as investors react to misleading signals. Currently, real GDP growth is reported as only slightly lower than nominal GDP growth, with a deflator below 1 percent. This narrow gap raises questions about whether the figures truly reflect underlying price dynamics.
Strengthening India's Economic Data
Relying on an old WPI is a structural weakness in India's economic data system. The small difference between nominal and real GDP growth, driven by a weak deflator, risks creating a false sense of economic stability or urgency. If businesses and investors make crucial decisions based on growth figures that don't accurately reflect actual price levels, it can result in poor investment strategies and resource misallocation. Central banks need trusted inflation data to manage the economy effectively and avoid issues like deflation. Experts recommend urgently implementing a new WPI series or, preferably, adopting a comprehensive PPI. Such a change would boost the accuracy and credibility of India's economic indicators, providing a more reliable basis for policy and investment decisions in a changing global economy. Until then, the NAS series may not fully capture the true economic picture.