30 years equals about 11,000 days. One might assume that eliminating a few of those days would have little impact on investment performance during that time. Yet, if the ten best days of the S&P 500 Index for the period 1983- 2013 are excluded, the average annual return drops from 8.40% to 5.80%. If the twenty best days are excluded, the average annual return drops to 4.09%.

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