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 Inflation and Your Portfolio Even low inflation rates can pose a threat to investment returns. Why Regular Rebalancing Makes Sense Without your knowing, your investment portfolio could be off-kilter. What Is the Dividend Yield? This calculator helps determine your pre-tax and after-tax dividend yield on a particular stock.