Score contribution per author:
α: calibrated so average coauthorship-adjusted count equals average raw count
When providing public goods through voluntary contributions, a donor may introduce unilateral matching in order to reduce underprovision of the public good and thus inefficiency. By itself, however, matching benefits the donor but harms the recipient. We apply Cornes and Hartley’s aggregative game approach to provide a novel graphical explanation of this transfer paradox, and also show how it may be avoided by introducing a commitment device.