Score contribution per author:
α: calibrated so average coauthorship-adjusted count equals average raw count
In an artefactual field experiment with a large and heterogeneous population sample, we test the implications of social norms for market interactions associated with negative real-world externalities. We run large stylized markets in which sellers and buyers decide whether to enter the market and how much to bid for experimental coupons. Trading leads to profits for sellers and buyers but at the same time destroys donations for a good cause.