一、引言“垄断”本身具有双重性质:一方面它可能是高效率的结果,并能够通过规模经济和范围经济显著地提高效率;另一方面也可能导致市场力量的增加和共谋成本的降低,损害消费者和社会的福利。因此反垄断法需要对这两个因素加以权衡。效率抗辩法律制度即是这一权衡的具体体现。借由效率抗辩制度,当事人若能证明垄断协议、市场支配性行为或经营者集中的效率效果足以抵消或超过限制竞争的后果,那么其就能够获得反垄断法的 I. INTRODUCTION The “monopoly” itself is dual in nature: on the one hand it may be the result of an efficient and efficient economy through economies of scale and economies of scale; on the other hand it may also lead to an increase in market forces and a complicity in costs Reduce the damage to consumers and social welfare. Therefore, the antitrust law needs to weigh these two factors. The legal system of efficiency defense is a concrete manifestation of this trade-off. With the efficiency defense system, parties can prove that the monopoly agreement, the market dominant behavior or the concentration efficiency of the operator is enough to offset or surpass the consequences of restricting competition, then they can obtain the anti-trust law