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 Message Thank you! Oops! Related Content Should I Invest in Gold? Learning more about gold and its history may help you decide whether it has a place in your portfolio. 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.