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 Fed and How It Got That Way Here is a quick history of the Federal Reserve and an overview of what it does. How the Federal Reserve Works Each day, the Fed is behind the scenes supporting the economy and providing services to the U.S. financial system. 5 Smart Investing Strategies Getting what you want out of your money may require the right game plan.