Percentage, on average, that stocks outperform fixed-income investments: 1926-2015
Over the long term, according to a study of rolling periods based on data provided by Morningstar, stocks have almost always outperformed bonds. Even among shorter holding periods, stocks still outperformed bonds more often than not.
“Looking at rolling 30-year periods, stocks have always outperformed Treasury bills and intermediates, and have only rarely underperformed long-term Treasuries. Even for periods as short as five years, stocks have done better than the various fixed-income categories 71 to 76 percent of the time.”