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"Anyone of any persuasion ought to be able to acknowledge that economic logic indicates that imposing a price ceiling on milk will, other things equal, create a shortage of milk. But that in itself is not an argument against the policy. Mises assumed the policymaker would have thought that result bad, but the economist qua economist cannot declare it such. As Israel Kirzner likes to say, the economist’s job in the policy realm is merely to point out that you cannot catch a northbound train from the southbound platform." - Sheldon Richman