A one time investment for 11 years of (on average 14%) -This strategy uses simple indicators to determine an entry which indicate trend reversal-- such as MACD and the fact that the 2008 credit crisis crash was likely to fall to previous resistance (dot com crash) -Safe strategy, you're essentially betting on the American Economy and when you're at rock bottom it's more likely to go up than a full economic collapse in western society. -This is ofcourse hypothetical but when the next crash hits, this is a good guide to follow. -Could be diversified with FTSE100 and other economically prosperous nations' indexes.
S&P500 Historical returns calculator was used in the process of this chart, these can be found on google.