Gross Domestic Product (GDP) is an economic concept that serves as a monetary measure of the total market value of all the final goods and services produced within a country's domestic borders during a specific period, typically a year or a quarter. It is the most comprehensive indicator of a nation's economic activity and health.
The modern concept of GDP was developed by economist Simon Kuznets for a 1934 U.S. Congress report, though earlier attempts to measure national income date back to Sir William Petty in 1665. Kuznets was tasked with creating a quantitative measure of economic health to understand the extent of the Great Depression's impact, which involved mass unemployment and a shrinking economy. After the Bretton Woods Conference in 1944, GDP became the primary tool for measuring a country's economy, replacing the previously preferred Gross National Product (GNP).
GDP is calculated using three main approaches, which should theoretically yield the same result: the production (or value-added) approach, the income approach, and the expenditure approach. The most common is the expenditure approach, which uses the formula: GDP = C + I + G + (X - M). Here, C is household consumption, I is business investment, G is government spending, and (X - M) is net exports (exports minus imports).
An informed reader should understand related concepts like Gross National Product (GNP), which measures the output of a country's residents regardless of where it is produced, unlike GDP which focuses on domestic borders. They should also know the difference between Nominal GDP, which uses current market prices, and Real GDP, which is adjusted for inflation to allow for accurate comparisons over time.
In India, the Ministry of Statistics and Programme Implementation (MoSPI) periodically revises the methodology and the base year for GDP calculation to reflect the evolving economy. The most recent significant change involves shifting the base year from 2011-12 to 2022-23, a recalibration that was delayed by events like the rollout of GST in 2017 and COVID-19. This revision, which integrates updated data sources like GST collections and aligns with global standards like SNA 2008, has resulted in a downward revision of the nominal GDP estimates for recent years, but the core mechanism of measuring total domestic production remains the same.