Final answer:
Without specific data, we cannot confirm the exact proportion of U.S. exporters that are small and medium-sized enterprises. However, it's evident that smaller economies benefit more significantly from international trade than larger economies like the U.S., which is less affected by globalization due to its size and internal division of labor.
Step-by-step explanation:
The statement that small and medium-sized enterprises accounted for nearly one-third of all U.S. exporters may sound plausible, but without the corresponding data provided in Table 1.2, we can't confirm it to be true or false. What is clear, however, is that the export/GDP ratio has generally been on the rise in recent times. The emphasis on the more significant impact of international trade on smaller economies like Belgium, Korea, and Canada, in contrast to large economies like the United States, conveys that the gains from international trade tend to be relatively more important to smaller countries. These smaller economies typically trade across borders to fully leverage division of labor, specialization, and economies of scale. In comparison, the U.S. economy is robust enough to sustain more of its division of labor within national confines, making it less reliant on globalization.