Updated and revised 2013. You often hear that stock investing is a sure thing over the “long run”. But as this chart from the NY Times and Crestmont Research shows, there is still a lot of variability involved. The matrix below visually displays the annualized returns for the S&P 500 for every starting and ending year from 1920 to 2010, adjusted for inflation, taxes, and transaction costs.
Your actual returns depend a lot upon when you start, and also when you finally withdraw:
After accounting for dividends, inflation, taxes and fees, $10,000 invested at the end of 1961 would have shrunk to $6,600 by 1981. From the end of 1979 to 1999, $10,000 would have grown to $48,000.
“Market returns are more volatile than most people realize,” Mr. Easterling said, “even over periods as long as 20 years.”
Some further observations: