As old problems are conquered, we expect to turn up new problems. A discipline lives on its unsolvved problems; and so, for better or worse, economics is likely to be a lively subject for as many years ahead as man can see.

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Quote text and notes from Wikiquote: Paul Samuelson (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.