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 Fed and How It Got That Way Here is a quick history of the Federal Reserve and an overview of what it does. Best-Performing Asset Classes Bonds may outperform stocks one year only to have stocks rebound the next. Taxable vs. Tax-Deferred Savings Use this calculator to compare the future value of investments with different tax consequences.