Where and how do we draw the boundaries of these obligations? We define a lot of "rights". Every property "right" imposes an obligation that others tolerate their exclusion from the use of a good. If I have a right to my own body and I stand in a doorway so you can't get by, does your "right" to enter the builder trump my "right" not to be physically manhandled? Who gets to do what, who has to tolerate what? Every right is also a burden. We have to collectively make these tradeoffs. 13/