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 Should I Invest in Gold? Learning more about gold and its history may help you decide whether it has a place in your portfolio. Best Performing Asset Classes Bonds may outperform stocks one year only to have stocks rebound the next. 5 Smart Investing Principles Principles that can help create a portfolio designed to pursue investment goals.