We examine patterns of adoption of a new airtime transfer service over time. We document a strong positive correlation between own adoption and increased usage of the new airtime transfer platform by social neighbours. We examine the possible sources of this correlation by distinguishing between network externalities that extend after adoption and social learning that stops after adoption. We find no correlation between usage by social neighbours and own usage after first adoption. We conclude that social learning about the existence and quality of a new product platform are important mechanisms in its diffusion.

中文翻译：

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采用社会学习和网络外部性*

我们研究了随着时间的推移采用新的通话时间转移服务的模式。我们记录了自己的采用与社交邻居对新通话时间转移平台的使用增加之间存在很强的正相关关系。我们通过区分采用后扩展的网络外部性和采用后停止的社会学习来检查这种相关性的可能来源。我们发现社交邻居的使用与首次采用后自己的使用之间没有相关性。我们得出结论，关于新产品平台的存在和质量的社会学习是其传播的重要机制。