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. Have A Question About This Topic? Name Email Address Message Thank you! Oops! Related Content All Muni Bonds Are Not Created Equal Gaining a better understanding of municipal bonds makes more sense than ever. Systematic Withdrawals in Retirement Taking regular, periodic withdrawals during retirement can be quite problematic. Tax Efficiency in Retirement What role would taxes play in your investment decisions?