{"slug":"nogo-n02","verification":{"valid":false,"broken_at":0,"reason":"prev mismatch"},"count":3,"sources":[{"id":"s1","type":"book","url":"https://en.wikipedia.org/wiki/Social_Choice_and_Individual_Values","title":"Social Choice and Individual Values","quote":"Arrow proved the impossible. No system satisfies all five when three or more options exist.","summary":"Arrow's foundational 1951 work proving the impossibility theorem in social choice theory.","author":"Kenneth J. Arrow","publisher":"Wiley","date":"1951","claim_ids":["c1","c2","c3","c4"]},{"id":"s2","type":"award","url":"https://www.nobelprize.org/prizes/economic-sciences/1972/summary/","title":"Nobel Prize in Economic Sciences 1972","quote":"Arrow won the Nobel Prize in 1972. The mathematics is absolute.","summary":"Arrow's 1972 Nobel Prize recognizing his work on social choice theory and general economic equilibrium.","author":"Kenneth J. Arrow","date":"1972","claim_ids":["c5"]},{"id":"s3","type":"paper","url":"https://www.jstor.org/stable/1830193","title":"The Impossibility of a Paretian Liberal","quote":"Amartya Sen extended Arrow in 1970. He showed that even minimal liberalism creates impossibility.","summary":"Sen's 1970 extension of Arrow's theorem demonstrating conflict between individual rights and Pareto efficiency.","author":"Amartya K. Sen","publisher":"Journal of Political Economy","date":"1970","claim_ids":["c6"]}]}