We apply Png's (1983) model to antitrust suits to determine the effect
s of private suits on government suits and vice versa. In equilibrium,
a defendant can probabilistically signal a strong case by nor offerin
g to settle. A violator's incentive to signal a strong case to deter a
treble damage suit forces the government to pursue more trials than i
t would otherwise. Private plaintiffs are more likely to settle follow
ing a government suit than otherwise, but they win a trial with the sa
me probability regardless of whether there was a previous government s
uit. Data on private suits support the latter two contentions.