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 You Invest in Exchange Traded Funds? There are hundreds of ETFs available. Should you invest in them? Why Regular Rebalancing Makes Sense Without your knowing, your investment portfolio could be off-kilter. 5 Smart Investing Principles Principles that can help create a portfolio designed to pursue investment goals.