It Was the Best of Times, It Was the Worst of Times All about how missing the best market days (or the worst!) might affect your portfolio. 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. Why Regular Rebalancing Makes Sense Without your knowing, your investment portfolio could be off-kilter. The Utility of Sector Investing Successful sector investing is dependent upon an accurate analysis about when to rotate in and out.