一、效果原则的确立及其演变在反垄断法发展的相当一段时间内 ,各国主要致力于通过反垄断法的国内实施来控制国内的经济集中。2 0世纪 80年代以后 ,随着跨国公司的迅猛发展 ,全球范围内的经济集中日益严重 ,反垄断法所赖以存在的经济环境已从国内竞争走向了国际竞争、从国内经 First, the establishment of the principle of effectiveness and its evolution In the development of antitrust law for a considerable period of time, all countries are mainly committed to controlling the domestic economic concentration through the domestic implementation of the antitrust law. Since the 1980s, with the rapid development of transnational corporations and the increasingly concentrated global economy, the economic environment on which the anti-monopoly law depends has gone from domestic competition to international competition. From the perspective of domestic economy