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 Events on Wall Street Can successful investors predict changes in the markets? Some can but others miss the market’s signals. The Investment Risk No One’s Ever Heard Of You face a risk for which the market does not compensate you, that can not be easily reduced through diversification. 5 Smart Investing Principles Principles that can help create a portfolio designed to pursue investment goals.