Two important topics in industrial organization are the difference between quantity and price competition in oligopoly, and the role of product differentiation in determining market outcomes. We consider a consistent framework in which these issues can be explored, using a base model of product differentiation. We consider the properties of the market outcomes under price and quantity competition, with both simultaneous and sequential moves. We then present a series of numerical simulation models that can be used to efficiently explore the model properties under various assumptions. The models are built in Excel, and utilize both numerical and graphical presentations. They are suitable for classroom use in presentations, and in directed student assignments. We discuss a number of exercises, and our experiences with using the models in a number of different course contexts.

产业组织中的两个重要主题是寡头垄断中的数量竞争和价格竞争之间的区别，以及产品差异化在确定市场结果中的作用。我们考虑使用产品差异化的基本模型来探索这些问题的一致框架。我们同时考虑价格和数量竞争下的市场结果属性，包括同时移动和顺序移动。然后，我们提出了一系列数值模拟模型，这些模型可用于有效地探索各种假设下的模型属性。这些模型是在Excel中构建的，并利用了数字和图形表示形式。它们适合在演示文稿和定向学生作业中的课堂使用。我们讨论许多练习，