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"La théorie des préférences révélées ou lorsque la rationalité se passe de la notion d'utilité.<br>La «révolution» ordinaliste ou comment la notion d'utilité a-t-elle connu des modifications significatives?<br>Les théories de la décision ou le passage d'une situation de certitude à une situation risquée voire incertaine.<br>Le passage à une conception ordinale de l'utilité (Pareto et la notion d'arbitrage puis le TMS de Hicks 1934 = la quantité nécessaire de bien Y à laquelle le consommateur doit renoncer afin d'augmenter d'une unité la consommation du bien X tout en maintenant l'utilité constante)<br>Paul Samuelson (1938) revendique explicitement l'objectif d'évincer de la théorie du consommateur toute référence aux états mentaux ainsi que toute dimension psychologique (= l'homo oeconomicus)"

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