S&P historical returns for 5 worst periods
Graph source: Robert Shiller
Drop over previous 5 years: 37.4 percent
Stock prices soared through the 1920s, but the party ended with a crash in 1929. There was no quick and easy resolution for investors or for the economy. Stock prices continued to plummet through 1930, 1931 and well into 1932 before turning around.