 The obvious objection to this claim is that it is not clear why the first people to acquire some part of the material world should be able to exclude others from it (and, for instance, be the land owners while the later ones become the wage laborers). In response to this objection, Nozick follows Locke in recognizing the need for a qualification on just acquisition. According to the Lockean Proviso, an exclusive acquisition of the external world is just, if, after the acquisition, there is ‘enough and as good left in common for others’. One of the main challenges for libertarians has been to formulate a morally plausible interpretation of this proviso. According to Nozick’s weaker version of Locke’s Proviso, “a process normally giving rise to a permanent bequeathable property right in a previously unowned thing will not do so if the position of others no longer at liberty to use the thing is thereby worsened” (Nozick, 1974, p. 178). For Nozick’s critics, his proviso is unacceptably weak. This is partly because it fails to consider the position others may have achieved under alternative distributions and thereby instantiates the morally dubious criterion of whoever is first gets the exclusive spoils. For example, one can satisfy Nozick’s proviso by ‘acquiring’ a beach and charging $1 admission to those who previously were able to use the beach for free, so long as one compensates them with a benefit they deem equally valuable, such as a clean-up or life-guarding service on the beach. However, the beach-goers would have been even better off had the more efficient organizer among them acquired the beach, charging only 50 cents for the same service, but this alternative is never considered under Nozick’s proviso (Cohen, 1995).