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 Contents Investments You’ve made investments your whole life. Work with us to help make the most of them. What’s Your Investment IQ? You make decisions for your portfolio, but how much do you really know about the products you buy? Try this quiz Inflation and Your Portfolio Even low inflation rates can pose a threat to investment returns.