The Cycle of Investing Understanding the cycle of investing may help you avoid easy pitfalls. Share | 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. The ABCs of Zero Coupon Bonds Understanding some basic concepts may help you assess whether zero-coupon bonds have a place in your portfolio. 5 Smart Investing Principles Principles that can help create a portfolio designed to pursue investment goals.