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. Inflation & Your Money It's important to understand how inflation is reported and how it can affect investments. Keys to Investing for Retirement There are some key concepts to understand when investing for retirement.