Private law
If government doesn’t, who will uphold the law?
Please see “Private production of Defence”, Chapter 12 from “For a New Liberty”, Chapter 9 from “The Ethics of Liberty”, Chapter 13 from “The Ethics of Liberty”, Legislation and Law in a Free Society and Legislation and the discovery of law in a free society.
Also, Professor Hans-Hermann Hoppe gave a lecture at our very own Mises Seminar in Australia just a few months ago on this topic:
If you have any questions remaining after going through the aforementioned, please add your constructive conclusions in the threaded comment section below.