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 The Business Cycle How will you weather the ups and downs of the business cycle? Why Regular Rebalancing Makes Sense Without your knowing, your investment portfolio could be off-kilter. 5 Smart Investing Principles Principles that can help create a portfolio designed to pursue investment goals.