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 Inflation and Your Portfolio Even low inflation rates can pose a threat to investment returns. Value vs. Growth Investing Among stock-market investors there’s long been a debate between those who favor value and those who favor growth. 5 Smart Investing Strategies Getting what you want out of your money may require the right game plan.