Various writers in the Western liberal and libertarian tradition have challenged the argument that enforcement of law and protection of property rights are public goods that must be provided by governments. Many of these writers argue explicitly for the provision of law enforcement services through private market relations.

Libertarianism holds that agents initially fully own themselves and have moral powers to acquire property rights in external things under certain conditions. It is normally advocated as a theory of justice in the sense of the duties that we owe each other. So understood, it is silent about any impersonal duties (i.e., duties owed to no one) that we may have.