通过建立数量折扣设计优化模型,利用委托代理理论分别分析了完全和不完全需求信息条件下,商品供应商如何为一群异质的零售商制定价格政策,实现其中望利润的最大化.在完全需求信息条件下,单一价格就能使供应商实现利润最大化;而在需求信息为不对称条件下,逆向选择使单一价格失效,此时,数量折扣是一种能够有效增加零售商订货量的激励方式. By establishing a quantitative discount design optimization model and using principal-agent theory to analyze the condition of complete and incomplete demand separately, how to set price policy for a group of heterogeneous retailers so as to maximize profit among them Under the condition of information, a single price can maximize the profit of the supplier. When the demand information is asymmetric, the adverse selection will invalidate the single price. In this case, the quantity discount is an incentive to effectively increase the retailer’s order quantity the way.