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? Required Reading: The Economic Report of the President The Economic Report of the President can help identify the forces driving — or dragging — the economy. 5 Smart Investing Principles Principles that can help create a portfolio designed to pursue investment goals.