In the face of market failure, coase has given the opposite answer: external-utility problems can be solved by explicitly using the market, without government intervention. And zhang wuchang is more absolute, he said that there is no so-called external utility, there is only unclear property rights. Anyway, coase brought revolutionary innovation to market concepts. He made it clear that the key to the market was not the "price mechanism" of impersonal machinery, but the power of participants in economic activity (property rights) Taking wedding photos is an indispensable part of wedding preparation. Now the post-80s generShooting can be interpreted as firing gun, shooting movement. The firing of a gun, the process by which the archer USES a gun to accurately launch and hit a given target. The shooting movement is a competitive project aimed at targeting targets with guns.Shooting can be interpreted as firing gun, shooting movement. The firing of a gun, the process by which the archer USES a gun to accurately launch and hit a given target. ation has reached the marriageable age, and the post-90s are no longer wedded to stereotypical photography, preferring to shift from shade to seaside, grassland and sunlight.