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 Your Personal Recovery As the economy gathers momentum, many are waiting for their personal finances to gather momentum, too. How Stocks Work Understanding how a stock works is key to understanding your investments. 5 Smart Investing Strategies Getting what you want out of your money may require the right game plan.