TOEFL Listening: ETS-TOEFL听力机经 - 3W3YKV83IP8S63N3P$

According to the professor, for what purpose do economists use the concept of net exports? A. To measure imbalances between exports and imports. B. To describe a country's total exports for a year. C. To explain how trade deficits occur. D. To differentiate between exports and trade surpluses.