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 The Real Cost of a Vacation Home What if instead of buying that vacation home, you invested the money? All Muni Bonds Are Not Created Equal Gaining a better understanding of municipal bonds makes more sense than ever. Keys to Investing for Retirement There are some key concepts to understand when investing for retirement.