【正确答案】 A

【答案解析】Price discrimination is the practice of charging different consumers different prices for the same product or service. For price discrimination to work the seller must: 1 ) have a downward sloping demand curve, 2) have at least two identifiable groups of customers with different price elasticities of demand, 3) must be able to prevent customers in the lower-price group from reselling the product to customers in the higher-price group.