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 | Related Content Should You Invest in Exchange Traded Funds? There are hundreds of ETFs available. Should you invest in them? A Decision Not Made Is Still a Decision Investors who put off important investment decisions may face potential consequence to their future financial security. Keys to Investing for Retirement There are some key concepts to understand when investing for retirement.