Score contribution per author:
α: calibrated so average coauthorship-adjusted count equals average raw count
I provide a full characterization of the set of absolutely expedient learning rules introduced in Börgers et al. [2]. The expected change in the expected payoff can be written as a quadratic form on the vector of relative expected payoffs of the strategies. This permits use of standard linear algebra arguments to provide a characterization in terms of the matrix defining this quadratic form.