Score contribution per author:
α: calibrated so average coauthorship-adjusted count equals average raw count
We show that the folk theorem in Wen [Q. Wen (1994), The "Folk Theorem" for repeated games with complete information, Econometrica, 62, 949-954.] may not fully characterize the subgame perfect equilibrium payoff set in a repeated game with unequal discounting, where a player's equilibrium payoff could be strictly less than her effective minimax payoff.