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John Broome (1999). Normative Requirements. Ratio 12 (4):398â419. http://users.ox.ac.uk/~sfop0060/pdf/normative%20requirements.pdf ããªãåççã§ãããã°ãªããªãã®ã Why be rational?ãã¨ããåé¡ã«é¢å¿ãããã¾ããããªãéå¾³çã§ãããã°ãªãâ¦