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WeChat, an instant messaging app, is considered a mega app due to its dominance in terms of usage among Chinese smartphone users. Nevertheless, little is known about its externality in regard to the broader app market. Our work estimates the spillover effects of WeChat on the other top-50 most frequently used apps in China through data on users' weekly app usage. Given the challenge of determining causal inference from observational data, we apply a graphical model and econometrics to estimatedoi:10.2139/ssrn.2842138 fatcat:gog3g6spdjfrjkq66ycrbyqpca