馬虎活得糊糊塗塗，糊塗做事馬馬虎虎
難得糊塗。望能幫助大家解答投資理財的問題。使大家在投資理財的過程中， 不馬馬虎虎以及不糊糊塗塗被人忽悠, 盡快實現財務自由。
正文
The real S&P 500 started on February 27th, 1957. The data before that can not be used for return calculation purposes since the index was not 500 stocks. It has very small numbers of stocks called 'Composite Index'. Starting in 1957, we have 60 years data to use for calculating the returns which is around 10% average annually.
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