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23rd September 2024 (9 Topics)

On the pitfalls of estimating GDP

Context

India's GDP measurement is in discussion due to the proposed revision of the base year from 2011-12 to 2020-21, with the National Statistical Office considering the use of Goods and Services Tax (GST) data, raising concerns about accuracy and the need for validation amidst skepticism over past overestimations.

What is GDP?

  • Gross Domestic Product (GDP) is a key indicator of a country's economic size. It measures the total value of goods and services produced over a specific period and is used to compare economic performance across countries.
  • The GDP growth rate is calculated by comparing the GDP of one period with the GDP of a previous period.
  • Current Base Year and Proposed Change
    • The current GDP calculation uses 2011-12 as the base year.
    • A revision is planned to change the base year to 2020-21.
    • This change aims to better reflect economic conditions and improve accuracy.

Why Change the Base Year?

  • The National Statistical Office (NSO) is considering using Goods and Services Tax (GST) data instead of the current MCA-21 database, which records corporate financial data.
  • GST data is thought to provide a more comprehensive view of economic activity.
  • Challenges with the Current System
    • The MCA-21 database was introduced in the last revision but has faced criticism for overestimating growth.
    • Previous estimates showed a significant difference in growth rates between the new GDP series and older data, raising doubts about accuracy.
  • Concerns About Using GST Data
    • While GST data could enhance GDP estimates, its effectiveness is uncertain without thorough testing.
    • The NSO is urged to conduct pilot studies to validate GST data for specific industries and regions.
    • Transparency and independent verification of the GST data are crucial for establishing trust in GDP estimates.

Fact Box:

Calculation of GDP

  • GDP is calculated using the following formula:
                        Y = C + I + G + (X − M)
  • C = consumption (spending on services, non-durable goods, and durable goods)
  • G = government expenditure (salaries of employees, construction of roads, railways, airports, schools, and military expenses)
  • I = investment (spending on housing and equipment)
  • X-M = net exports (difference between total exports and imports)
  • In this context, Y represents the Gross Domestic Product.

Base Year

  • The base year serves as a reference point for measuring changes in economic variables and comparing the relative performance of indicators over time.
  • For example, real GDP growth is currently calculated with reference to FY12 prices.
  • Currently, key economic measures like the Index of Industrial Production (IIP), Wholesale Price Index (WPI), and National Income are anchored to FY12, previously benchmarked to FY05.
  • The last change in the GDP computation base year, from FY05 to FY12, improved coverage of financial corporations, local bodies, and autonomous institutions and included methodological changes.
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