Adoption with Social Learning and Network Externalities*
研究新通话时间转移服务的采纳模式，发现社会邻居的使用与个人采纳正相关，但首次采纳后邻居使用不再影响个人使用，表明社会学习是扩散的关键机制。
ABSTRACT 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.