The area includes the doctrine of restraint of trade .
The area has largely been submerged in the twentieth century by statutory interventions on collective labour law , modern antitrust or competition law , and certain laws governing intellectual property , particularly unfair competition law .
The area includes the doctrine of restraint of trade and has largely been submerged in the twentieth century by statutory interventions on collective labour law , modern antitrust or competition law , and certain laws governing intellectual property , particularly unfair competition law .