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Huh? Generally people like to talk about "pricing externalities" but they generally mean they want to price YOUR externalities and not theirs. For example, they will say: you don't pay enough for gas due to blah blah blah. But then they don't have a replacement number of kids and would freak if you upped their social security contribution. I think you can make arguments, though, for free bus service to avoid building new roads, to cite an example of something that is not free but seems to be. Did I understand the question? -XC