5 Smart Investing Principles The slideshow presentation that you would like to view is too large for your current screen resolution. Click here to view to view the slideshow at full resolution. Launch Presentation » 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. The Business Cycle Understanding the economy's cycles can help put current business conditions in better perspective. 5 Smart Investing Strategies Getting what you want out of your money may require the right game plan.