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 New Wild West: Bitcoin Bitcoin’s future is uncertain, but one thing is for sure: it’s the wild west out there, and there is no sheriff in town. The Utility of Sector Investing Successful sector investing is dependent upon an accurate analysis about when to rotate in and out. Keys to Investing for Retirement There are some key concepts to understand when investing for retirement.