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 Where Is the Market Headed? We all know the stock market can be unpredictable. We all want to know, “What’s next for the financial markets?” Types of Stock Market Analysis Most stock market analysis falls into three broad groups: Fundamental, technical, and sentimental. Here’s a look at each. Keys to Investing for Retirement There are some key concepts to understand when investing for retirement.