The previous literature has shown that if the agent has limited assets
, the vicarious liability law under a strict liability rule can effect
ively make the principal monitor her agent, and induce the agent to ta
ke more care, which thereby reduces the social cost. In practice the n
egligence rule still applies to many tort cases, and the principal's m
onitoring evidence is often needed to prove the agent's negligence. It
is possible that the principal will conceal the monitoring evidence f
rom the court in order to avoid the vicarious liability. In such a cas
e the society has to incur higher investigation cost than otherwise. T
o save the investigation cost, the court may want to provide incentive
s to induce honest reports either by lowering the due care level, or b
y lowering the level of vicarious liability.