5  The rate-of-return puzzle is in turn a question about why foreign direct investment in the United States has such a low rate of return. See Raymond J. Mataloni, Jr., “An Examination of the Low Rates of Return of Foreign-Owned U.S. Companies”, Survey of Current Business, vol. 80 (March 2000), pp. 55-73.
6  Even though the previous identity referred to the consumption budget for the entire government sector, in this section I switch over to the familiar concept of the total budget for the U.S. federal government.