所谓有效供给是指与消费需求和消费能力相适应的供给,即产品的供需平衡。任何一种产品的市场均衡产量和价格都是由该产品的供给曲线和需求曲线的交点决定的。其需求曲线应与该产品消费方的边际效用曲线相一致,供给曲线应与该产品生产方的边际成本曲线相一致。这样,社会边际收益等于社会边际成本,帕累托最优得以实现。 The so-called effective supply refers to the consumer demand and spending power to adapt to the supply, that is, product supply and demand balance. Market equilibrium output and price of any kind of product are determined by the intersection of the product supply curve and demand curve. The demand curve should be consistent with the marginal utility curve of the consumer and the supply curve should be consistent with the marginal cost curve of the producer. In this way, the marginal benefit of society is equal to the marginal cost of society, Pareto optimally achieved.