The World is a book, and those who do not travel read only a page.
Over the 10 years through 2006, a portfolio split 80%-20% between U.S. and international large-cap stocks would have returned an average 8.4% a year, roughly the same as a portfolio invested 100% in domestic stocks. But because U.S. and foreign markets partially offset one another's ups and downs, the global portfolio was 4% less risky than the all-American (see Rule No. 4). Most Americans have less money in foreign funds than the 15% to 25% experts recommend. But you don't have to be like most Americans.