November 20, 2023 Smaldino, P.E., M.A. Janssen, V. Hillis, and J. Bednar (2017). Adoption as a social marker: Innovation diffusion with outgroup aversion. Journal of Mathematical Sociology 41(1): 26-45. Home » Smaldino, P.E., M.A. Janssen, V. Hillis, and J. Bednar (2017). Adoption as a social marker: Innovation diffusion with outgroup aversion. Journal of Mathematical Sociology 41(1): 26-45.