Input Price Discrimination, Demand Forms, And Welfare*
分析了上游垄断厂商对效率不同的下游企业实行投入品价格歧视的影响，发现需求曲率与传导弹性之和是决定福利效应的关键因素，并给出了常曲率需求的例子。
We analyse the effects of input price discrimination in the canonical model where an upstream monopolist sells to downstream firms with various degrees of efficiency. We first recast a series of existing results within our setting, extending previous findings related to discrimination in final‐goods markets to the case of discrimination in input markets. Then, we examine the impact of input price discrimination on welfare. A key determinant of the effects of input price discrimination corresponds to the sum of demand curvature and pass‐through elasticity. We provide examples relying on derived demands with constant curvature, including demands with constant pass‐through rates.