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What's the average rate of return for some of the most mainstream index funds?
This page from simplestockinvesting.com gives details of total returns for the S&P500 for each decade over the last 60 years, including total returns for the entire 60 year period. It is important to understand that, from an investors point of view, the total return includes both the change in index value (capital gain) plus dividends received.  This total then needs to be adjusted for inflation to give the "total real return". As noted in the analysis provided, 44% of the total return from the S&P500 over the last 80 years comes from dividends.  For the DowJones30, this site provides a calculator for total returns and inflation adjusted total returns for user selected periods. Finding comparable analysis for the NASDAQ market is more difficult.  The NASDAQ market site provides gross values for total returns over fixed periods, but you will then need to do the arithmetic to calculate the equivalent average annual total returns.  No inflation adjusted values for "real" returns are provided, so again you will need to combine inflation data from elsewhere and do the arithmetic.