How Stocks Work Full Size Version Share | Related Content 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. You Would Rather Be... Are you a thrill seeker, or content to relax in the backyard? Use this flowchart to find out more about your risk tolerance. How Compound Interest Works Use this calculator to better see the potential impact of compound interest on an asset.