The GDP (Gross Domestic Product) is a key indicator for measuring a country's economic activity. However, it is a lagging indicator, and therefore difficult to use for investment forecasting.
For this reason, the Federal Reserve Bank of Atlanta conducts a real-time estimate, GDPnow, which is regularly updated as new data becomes available. The calculation methodology is similar to the official statistics, but with real-time updates. It is therefore a current economic activity estimator, very useful for making investment decisions.