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. Share | Related Content What Can a Million Dollars Buy You? $1 million in a diversified portfolio could help finance part of your retirement. Pullbacks, Corrections, and Bear Markets Pullbacks, corrections, and bear markets are all a part of the investing cycle. When the market experiences volatility, it may be a good time to review these common terms. Saving for College This calculator can help you estimate how much you should be saving for college.