Efficient provision of public goods requires that the sum of the individual MRSs equal the MRT, unlike private goods where each MRS equals the MRT.

• 公共产品的有效提供要求个人的边际替代率之和等于边际转换率,而不像私人产品,私人产品的有效提供要求个人的边际替代率等于边际转换率。