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"common law" refers to British common law, a set of basic civil laws. Who builds the courthouses? who pays for the heat? who selects judges? who determines what is legal and what is not?
The government via taxation. That is one of their most basic and essential tasks. Without the government you don't have a third party to settle disputes in a civil manner, then you have chaos and violence as people settle disputes in an uncivil manner.

@finnian, you're wasting your breath with this "know-it-all." They're incapable of doing any personal research...much like the trolls on other social media platforms...full of self-righteousness and unfounded arguments, resides beneath a bridge and tries to scare anyone with an opinion that isn't as morally superior as theirs...you cannot educate the unwilling, for you have nothing to teach them that they didn't know coming out of the womb.