From Boats to Brokers From the Dutch East India Company to Wall Street, the stock market has a long and storied history. Share | Related Content The Rule of 72 Do you know how long it may take for your investments to double in value? The Rule of 72 is a quick way to figure it out. Investment Challenges of the Affluent Investor Affluent investors face unique challenges when putting together an investment strategy. Make sure you keep these in mind. Saving for College This calculator can help you estimate how much you should be saving for college.