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 Emerging Market Opportunities What are your options for investing in emerging markets? 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 Principles Principles that can help create a portfolio designed to pursue investment goals.