Table of contents : Preface Introduction I. The Collapse of the Fact/Value Dichotomy 1. The Empiricist Background 2. The Entanglement of Fact and Value 3. Fact and Value in the World of Amartya Sen II. Rationality and Value 4. Sen’s “Prescriptivist” Beginnings 5. On the Rationality of Preferences 6. Are Values Made or Discovered? 7. Values and Norms 8. The Philosophers of Science’s Evasion of Values Notes Index