Score contribution per author:
α: calibrated so average coauthorship-adjusted count equals average raw count
An antitrust authority grants leniency pre- and post-investigation. It chooses the probability of an investigation. Firms pick the degree of collusion: The more they collude, the higher are profits, but so is the probability of detection. Firms thus trade-off higher profits against higher expected fines. If firms are sufficiently patient, leniency is ineffective; it may even increase collusion. Increasing the probability of an investigation at low levels does not increase deterrence. Increasing the probability of an investigation at high levels reduces collusion, yet never completely. With bare pre-investigation leniency, deterrence is better than without leniency. If firms are sufficiently impatient, granting leniency pre- and post- is better than merely pre-investigation.