U.S. stocks returned about 10% a year over the past century, with brutal drops between
Investors who held U.S. equities over the past century earned roughly 10 percent a year on average, a figure that includes reinvested dividends. That long-run average, however, conceals drawdowns severe enough to cut portfolios in half and test the resolve of even disciplined savers. With stock price records stretching back to the 1870s and academic…