Before revision:  We find that placing cooperators on  high-degree nodes enhances cooperationin standard scale-free networks but not in standard Poisson networks. In contrast, under increased degree assortativity , Poisson networks can maintain high levels of cooperation, even exceeding those of scale-free networks, when the initial placement of cooperators is perfectly correlated to node degree.
After revision:  We find that placing cooperators on high-degree ) nodes can - as expected - enhance cooperation , Poisson networks can maintain high levels of cooperation, even exceeding those of scale-free networks, when the initial placement of cooperators is perfectly correlated to node degree.