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 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 A Look at Systematic Withdrawals This calculator may help you estimate how long funds may last given regular withdrawals. The Junk Drawer Approach to Investing It's easy to let investments accumulate like old receipts in a junk drawer.