> any good that, by its nature, can only be used by one person at a time: one person's use precludes use by another person. > There are edge cases--for example

> any good that, by its nature, can only be used by one person at a time: one person's use precludes use by another person. > There are edge cases--for example, multiple people can ride in a car even if it's only considered the private property of one of them--but they aren't relevant to the discussion we're having here. But that's not just edge cases. Jointly operated objects and co-habited houses make up a huge fraction of what we commonly consider to be property. I don't think you can brush this away as an edge case. I mean, come to think it, looking at what objects currently surround me, most of them can be used by more than one person at same time.