Here. I think it presents a good explanation for people who may be unfamiliar with it, and an excellent treatment of the problems with libertarianism. He also provides a great review of deontological vs. consequentialist perspectives that is accessible to people who don't know much about this. And finally he presents differences and nuances in the thought of people like Nozick and Hayek.
A lot of people are in the habit of screaming bloody murder when their outlook is not represented exactly how they would like it to be represented by a critical writer in the press I understand that - I do that too. But I think Sachs avoids these criticisms. Yes, he doesn't agree with libertarianism but he does an excellent job presenting it here. I would love to see a libertarian explain an American (i.e. constitutional and federalist) centrist, pragmatic Keynesianism like this. I have yet to see one do as good a job.
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