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 Inflation and Your Portfolio Even low inflation rates can pose a threat to investment returns. Best-Performing Asset Classes Bonds may outperform stocks one year only to have stocks rebound the next. How Compound Interest Works Use this calculator to better see the potential impact of compound interest on an asset.