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?” The Business Cycle Understanding the economy's cycles can help put current business conditions in better perspective. 5 Smart Investing Principles Principles that can help create a portfolio designed to pursue investment goals.