Unfortunately,consumers cannot easily determine the quality of a used car until after they purchase it. Buyers'lack of information prevents this mutually beneficial trade from occurring,thus resulting in market failure(市场失灵). As a result,the price of used cars falls,and high-quality cars are driven out of the market. ◼ Unfortunately, consumers cannot easily determine the quality of a used car until after they purchase it. Buyers’ lack of information prevents this mutually beneficial trade from occurring, thus resulting in market failure(市场失灵). ◼ As a result, the price of used cars falls, and high-quality cars are driven out of the market