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 Retirement Income and the Traditional Portfolio Experiencing negative returns early in retirement can potentially undermine the sustainability of your assets. What's My Potential Estate Tax? This calculator helps estimate your federal estate tax liability. What Can a Million Dollars Buy You? $1 million in a diversified portfolio could help finance part of your retirement.