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 Global and International Funds Investors seeking world investments can choose between global and international funds. What's the difference? Global vs. International: What’s The Difference? International funds invest in non-U.S. markets, while global funds may invest in U.S. stocks alongside non-U.S. stocks. Keys to Investing for Retirement There are some key concepts to understand when investing for retirement.