[Solved] The impotency drug Viagra acts by A)increasing whole body blood pressure. B)stimulating erotic mental images. C)increasing blood flow to the penis. D)decreasing blood flow to the penis. E)reducing the amount of seminal fluid. Marginal Revenue: The enhanced income derived from peddling an additional unit of a product or service. Marginal Cost: The increase in total cost that arises from producing one additional unit of a good or service, a critical factor in economic decision-making. Predatory Pricing: Practice of pricing to drive current competitors out of business and to discourage new entrants in a market so that a firm can enjoy higher future profits. Antitrust Laws: Legislation designed to regulate the conduct of businesses to promote fair competition for the benefit of consumers, preventing monopolies and practices that restrict trade.