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EconGym: a Gymnasium-style suite of economics RL environments with closed-form equilibrium benchmarks. Ships eight environments (Cournot, differentiated Bertrand, first/second-price auctions, public goods, repeated PD, Rubinstein bargaining, plus the faithful v0 homogeneous-good Bertrand collusion reproduction from Paper 1, 'The Two Faces of Algorithmic Collusion').