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 Bridging the Confidence Gap In the world of finance, the effects of the "confidence gap" can be especially apparent. Best Performing Asset Classes Bonds may outperform stocks one year only to have stocks rebound the next. Keys to Investing for Retirement There are some key concepts to understand when investing for retirement.