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 Where Will Your Retirement Money Come From? Retirement income may come from a variety of sources. Here's an overview of the six main sources. What Do Your Taxes Pay For? Here's a breakdown of how the federal government spends your tax money. Four Really Good Reasons to Invest There are four very good reasons to start investing. Do you know what they are?