The massive growth of sovereign wealth funds -- pools of capital controlled by governments and invested in private markets abroad -- should not cause alarm. But it does raise legitimate questions for the United States, pointing to the need for new policy principles for both the funds and the countries in which they invest.

The massive growth of sovereign wealth funds -- pools of capital controlled by governments and invested in private markets abroad -- should not cause alarm. But it does raise legitimate questions for the United States, pointing to the need for new policy principles for both the funds and the countries in which they invest.