5. An industry is characterized by scale economies and exists in two countries. In order for consumers of its products to enjoy both lower prices and more variety of choice, a. the marginal cost of this industry must equal marginal revenue in the other. b. each country's marginal cost must equal that of the other country. c. the two countries must engage in international trade one with the other. d. the monopoly must lower prices in order to sell more. e. None of the above