GDP measures the total monetary value of all finished goods and services produced within a country's borders in a specific period. Published quarterly by the Bureau of Economic Analysis (BEA) in the U.S., it is the single most comprehensive measure of economic activity.
Three Approaches to Measuring GDP
GDP can be calculated via expenditure (C + I + G + NX), income (wages + profits + rents + interest), or production (value added by each industry). All three should theoretically be equal.
Why Markets Care
The advance GDP estimate (released ~4 weeks after quarter-end) moves markets significantly. Two consecutive quarters of negative real GDP growth is the commonly cited definition of a 'technical recession,' though the official U.S. recession dating is done by the NBER Business Cycle Dating Committee using broader criteria.
Historical Context
U.S. GDP contracted 31.2% (annualized) in Q2 2020 during COVID β the largest single-quarter decline since records began in 1947 (BEA). It rebounded 33.8% in Q3 2020. During the 2008 Financial Crisis, GDP fell for four quarters. As of 2024, U.S. nominal GDP exceeds $28 trillion, making it the world's largest economy (World Bank).
Key Detail
Real GDP (inflation-adjusted) matters more than nominal GDP for economic analysis. The GDP deflator measures the price change of all goods and services included in GDP, making it broader than CPI.