Bursting the Bubble Tulips were the first, but they won’t be the last. What forms a “bubble” and what causes them to burst? Share | Have A Question About This Topic? Name Email Address Question Thank you! Oops! 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. Best-Performing Asset Classes Bonds may outperform stocks one year only to have stocks rebound the next. 5 Smart Investing Principles Principles that can help create a portfolio designed to pursue investment goals.