In the WSJ, economist Matthew Slaughter writes:
Academic research, including most recently by Harvard's Mihir Desai and Fritz Foley and University of Michigan's James Hines, has consistently found that expansion abroad by U.S. multinationals tends to support jobs based in the U.S. More investment and employment abroad is strongly associated with more investment and employment in American parent companies.
When parent firms based in the U.S. hire workers in their foreign affiliates, the skills and occupations of these workers are often complementary; they aren't substitutes. More hiring abroad stimulates more U.S. hiring. For example, as Wal-Mart has opened stores abroad, it has created hundreds of U.S. jobs for workers to coordinate the distribution of goods world-wide. The expansion of these foreign affiliates—whether to serve foreign customers, or to save costs—also expands the overall scale of multinationals.
Expanding abroad also allows firms to refine their scope of activities. For example, exporting routine production means that employees in the U.S. can focus on higher value-added tasks such as R&D, marketing and general management.
