<p>We took the data set from the SP500 Yahoo Finance Historical Data and tested it.</p><p><br></p><p>We only had open and close data from 1982 and after.&nbsp;</p><p><br></p><p>Methodology:  Rather than measuring calender years, we measured trading years on a daily basis.  Every day of every year we looked back 1 trading year and measured the results.</p><p><br></p><p>Results:</p><p>Over 9930 Periods, 7727 of periods the SP500 was higher than the same day in the previous trading year.  It was never the exact same.  1950 it was lower.</p><p><br></p><p>Mean returns were 10.6%</p><p>Median returns were 11.96%</p><p><br></p><p><br></p><p><br></p>

Do stocks only go up?

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Get historical data for the S&P 500 (^GSPC) on Yahoo Finance. View and download daily, weekly or monthly data to help your investment decisions.

S&P 500 (^GSPC) Historical Data

Do stocks only go up?

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