U.S. stocks have had a wild week, but a notable one. On Monday, the S&P 500 recovered its 2020 losses, while on Wednesday, the technology-heavy Nasdaq Composite closed above 10,000 for the first time, and the Dow Jones Industrial Average also logged gains before dropping back down during Thursday morning trading. 

But these market swings came as officials declared that the U.S. entered a recession in February. While experts generally define a recession as a period of significant decline in GDP in back-to-back financial quarters, the private non-profit research organization National Bureau of Economic Research said Monday that the "unprecedented magnitude of the decline in employment and production, and its broad reach across the entire economy, warrants the designation of this episode as a recession, even if it turns out to be briefer than earlier contractions."