标题： 两个就足够：通过正向网络效应的伯特兰德翻转 显示英文标题

标题： Two is enough: a flip on Bertrand through positive network effects

摘要： 我们讨论当正向网络效应是消费选择中的唯一其他因素时的价格竞争。 我们表明，将消费者分为两组会产生足够丰富的相互作用结构，以引发负的边际需求，并产生两个企业都能获利的纯价格均衡。 关键条件是一组具有向心影响力，而另一组具有离心影响力。 这一结果与正向网络效应依赖于单一综合变量的情况相反，并挑战了普遍假设，即需求必须基于具有特定属性的消费者特征分布进行微观基础构建，突出了相互作用结构在塑造市场结果中的重要性。 显示英文摘要

摘要： We discuss price competition when positive network effects are the only other factor in consumption choices. We show that partitioning consumers into two groups creates a rich enough interaction structure to induce negative marginal demand and produce pure price equilibria where both firms profit. The crucial condition is one group has centripetal influence while the other has centrifugal influence. The result is contrary to when positive network effects depend on a single aggregate variable and challenges the prevalent assumption that demand must be micro-founded on a distribution of consumer characteristics with specific properties, highlighting the importance of interaction structures in shaping market outcomes.