Libertarianism is a fairly recent offshoot of economic liberalism. That trajectory that dates back to Edmund Burke was warped into Libertarianism in the 1970s as capitalism morphed into a more concentrated form of corporatism. Robert Nozick gave it a philosophical gloss, but the real power in it comes from certain business groups and leaders who correctly understand that Libertarianism is the concentration of economic power into the hands of a few that translates into exclusivist political power. The movement overlaps with economic conservatism, though not social conservatism, but because money and power trump social issues for these people, conservative political parties have ceded much of their agenda to the Libertarians. I say there is nothing liberal about their ideology.