How Stocks Work Full Size Version Share | Have A Question About This Topic? Name Email Address Question 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. Earnings for All Seasons Earnings season can move markets. What is it and why is it important? 5 Smart Investing Principles Principles that can help create a portfolio designed to pursue investment goals.