Product Line Rivalry
研究多产品企业在实际决策中先定产品线、后定价格或产量的竞争，从需求侧战略角度解释为何同一企业常生产相近替代品，与常规认知不同。
This paper examines product selection by multi-product firms, taking explicit account of the sequential nature of real decisions: firms choose product lines before the quantity or price rivalry with other firms is resolved. Unlike most previous work, we focus on demand side strategic considerations rather than cost side. We find close substitutes produced by the same firm is a natural outcome, in contrast to conventional wisdom.