Why Do Suppliers Charge Larger Buyers Lower Prices?
提出供应商对大买家收取低价的新解释：这能降低买家在产出市场维持默契合谋的能力，从而有利于供应商，并揭示禁止价格歧视可能损害消费者福利的新机制。
The phenomenon of input suppliers charging larger buyer firms, relative to smaller buyer firms, lower prices is commonly explained in terms of supplier economies of scale, supplier competition for larger buyers, and the larger bargaining power of larger buyers. This paper provides an alternative explanation, and shows that the observed direction of differential pricing can benefit the supplier by lowering the level of tacit collusion its buyers can sustain in their output market. This result also provides a new mechanism through which a ban on price discrimination by input suppliers may lower consumer welfare.