Price and Quantity Competition in a Differentiated Duopoly
分析差异化双寡头中价格与数量的对偶性，发现当商品为替代品时企业选择数量合同为占优策略，互补品时则选择价格合同。
This article analyzes the duality of prices and quantities in a differentiated duopoly. It is shown that if firms can only make two types of binding contracts with consumers, the price contract and the quantity contract, it is a dominant strategy for each firm to choose the quantity (price) contract, provided the goods are substitutes (complements).