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Exclusion isn't always socially appropriate. If I take a cab home everyday (which I pay for), and a friend can literally take a free ride because her place is on the way, should I "exclude" her if she doesn't want to share the cost? She claims it doesn't cost me extra, I'd be paying for the cab anyway if she lived somewhere else.
But of course I can come up with un-excludable externalities:
I share a house that's in pretty bad shape, and I decide to get some fresh painting done. This is a net benefit to all the housemates, but we would value them differently. I want this slightly more than all the others. So I have to pay the entire amount.
Sure, that's why I asked you to describe what the "problem" you want to address is. Free stuff isn't a problem for recipients. Some providers consider it a problem, but IMO it's usually a different problem than they think.
The cab driver may be sad that they didn't get revenue from the second rider, and consider that to be a big problem. Your housemates may not consider old paint a problem, and almost certainly don't consider free paint to be a problem. You or your housemates may or may not consider jealousy or bad feelings about "fairnes... (read more)