In primitive societies, the entitlements to use land were frequently possessory rights rather than ownership rights. Those on the land could use it as they wished, but they could not transfer it to anyone else. One could acquire a new plot by simply occupying and using it, leaving the old plot available for someone else. Would this type of entitlement system cause more or less incentive to conserve the land than an ownership entitlement? Why? Would a possessory entitlement system be more efficient in a modern society or a primitive society? Why?