A simple investment thesis of investing in a low index fund (S&P 500) which has yielded about a 9% return over 50 years would product result most would find supremely satisfactory. Consider this, $10,000 compounded over 50 years without any additional capital and without taking any capital out would yield a return north of $25 million. However, the hardest part is not reacting emotionally to market dips and irrationally withdrawing your funds before the compounding machine really works. The other challenge is no one wants to get rich slow.