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α: calibrated so average coauthorship-adjusted count equals average raw count
We describe counterfeiting activity as the issuance of private money, one that is difficult to monitor. Our approach, which amends the basic random‐matching model of money in mechanism design, allows a tractable welfare analysis of currency competition. We show that it is not efficient to eliminate counterfeiting activity completely. We do not appeal to lottery devices, and we argue that this is consistent with imperfect monitoring.