"The consequences for human welfare involved in questions about human capital spillovers are simply staggering. Once one starts to think about them, it's hard to think of anything else"

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Modern economics is sick. Economics has increasingly become an intellectual game played for its own sake and not for its practical consequences for understanding the economic world. Economists have converted the subject into a sort of social mathematics in which analytical rigour is everything and practical relevance is nothing.

— Mark Blaug