We study how opinion leadership and social contagion within social networks affect the adoption of a new product. In contrast to earlier studies, we find evidence of contagion operating over network ties, even after controlling for marketing effort and arbitrary systemwide changes. More...

We show both analytically and through Monte Carlo simulations that applying standard hazard models to right-truncated data, i.e., data from which all right-censored observations are omitted, induces spurious positive duration dependence and hence can trick researchers into believing to have...

Building on the commentaries on our work, we make additional suggestions for future research on social contagion and new product diffusion. In particular, we note that social contagion may occur for many reasons and that investigating how various personal or group characteristics moderate the...