How Stocks Work Full Size Verison Share | Have A Question About This Topic? Address Thank you! Oops! Related Contents 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. Options When Your CD Matures Knowing your options when a CD matures can help you make a sound investment decision. 5 Smart Investing Principles Principles that can help create a portfolio designed to pursue investment goals.