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 Global and International Funds Investors seeking world investments can choose between global and international funds. What's the difference? TIPS for Inflation If you are concerned about inflation and expect short-term interest rates may increase, TIPS could be worth considering. Taxable vs. Tax-Deferred Savings Use this calculator to compare the future value of investments with different tax consequences.