“…Homophily can also affect whether information flows easily from one group to another or is instead impeded (e.g., Golub and Jackson (2012)). These effects can have pronounced implications across a range of important applications including access to employment opportunities (Granovetter (1974), Calvó-Armengol and Jackson (2004Jackson ( , 2007, Ioannides and Datcher-Loury (2004), Jackson (2007), Bayer, Ross, and Topa (2008), Beaman (2012), Gautier and Holzner (2013), Rubineau and Fernandez (2015), Battu, Seaman and Zenou (2011), Zenou (2013), social mobility (Calvó-Armengol and Jackson (2009), Munshi and Rosenzweig (2009)), marriage markets (Skopek, Schulz, and Blossfeld (2011)), health behavior (Centola (2011)), and educational achievement (Calvó-Armengol, Patacchini and Zenou (2009)). For example, in the labor market, homophily isolates workers of one ethnicity from workers of another ethnicity, which then limits the extent to which individuals in one group hear about openings and opportunities known to the other group.…”