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 Junk Drawer Approach to Investing It's easy to let investments accumulate like old receipts in a junk drawer. A Decision Not Made Is Still a Decision Investors who put off important investment decisions may face potential consequence to their future financial security. Keys to Investing for Retirement There are some key concepts to understand when investing for retirement.