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 Should I Invest in Gold? Learning more about gold and its history may help you decide whether it has a place in your portfolio. What’s Your Investment IQ? You make decisions for your portfolio, but how much do you really know about the products you buy? Try this quiz 5 Smart Investing Strategies Getting what you want out of your money may require the right game plan.