I'm reading The Market For Liberty, by Morris and Linda Tannehil, and I am struck by their take on property rights (chapter 6) . They seem to reject the Lockean/Rothbardian labour based system in favour of some kind of fiat property right system, in which you simply sign post the land you consider 'your's' and that's it, so long as the signs are visible. Am I missing something here? I know that they are Objectivists, is this typical of Objectivist property theory?