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Milton Friedman was one of the most brilliant economists of all time, but the weakness of his thinking is emblematic of the weakness of economic thought in general: exaggerating a partial truth into a universal truth. Economics starts with the assumption that more is "better" than less, a value judgement that certainly is true in a general sense, but not universally so. Eating two slices of pizza may be "better" than one, but eating 1000 slices may not be "better" than 999.
Milton Friedman was a master at exaggerating the particular into the general. A perfect example is his attitude toward drug addiction. Freedom of choice was the only criterion for him, ignoring all evidence from the fields of psychology, sociology, medicine, and criminology (and I don't mean the study of crimes related to illegality).
Friedman's other great weakness was his assumption that markets alone would make a mass industrial system work for the betterment of all. He never questioned the very premise of this belief - that the mass industrial system is a given, a precondition, an imperative. Underlying his brilliance was a fundamental dishonesty, borne out by his and his disciples' support and assistance to the dictatorship of Augusto Pinochet of Chile.
I always found Milton Friedman suspect because of his smug cocksureness. Anyone that self-satisfied is masking something. In his case it was the hollowness of his thought. Like most intellectualls, he built a house of cards. He had a superior intellect and was a masterful polemicist, but his real genius was in the power of exaggeration.