Different anarcho-capitalists propose different forms of anarcho-capitalism, and one area of disagreement is in the area of law. Morris and Linda Tannehill, in The Market for Liberty, object to any statutory law whatsoever. They assert that all one has to do is ask if one is aggressing against another (see tort and contract law) in order to decide if an act is right or wrong.[42] However, Murray Rothbard, while also supporting a natural prohibition on force and fraud, supports the establishment of a mutually agreed-upon centralized libertarian legal code which private courts would pledge to follow. Such a code for Internet commerce, called The Common Economic Protocols was developed by Andre Goldman.