Chicago-Kent Law Review Volume 81 Issue 1 Symposium: Promises, Commitments, Article 5 and the Foundations of Contract Law December 2005 Kant on "Why Must I Keep My Promise?" B. Sharon Byrd Joanchim Hruschka Follow this and additional works at: https://scholarship.kentlaw.iit.edu/cklawreview Part of the Law Commons Recommended Citation B. S. Byrd & Joanchim Hruschka, Kant on "Why Must I Keep My Promise?", 81 Chi.-Kent L. Rev. 47 (2006). Available at: https://scholarship.kentlaw.iit.edu/cklawreview/vol81/iss1/5 This Article is brought to you for free and open access by Scholarly Commons @ IIT Chicago-Kent College of Law. It has been accepted for inclusion in Chicago-Kent Law Review by an authorized editor of Scholarly Commons @ IIT Chicago-Kent College of Law. For more information, please contact
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[email protected]. KANT ON "WHY MUST I KEEP MY PROMISE?" B. SHARON BYRD AND JOACHIM HRUSCHKA* INTRODUCTION Why is it that I must keep my promise? Immanuel Kant,1 in his "Doc- trine of Right,"'2 tells us that everyone easily understands "I must." The duty to keep promises is a categorical imperative. 3 Kant says that any fur- * B. Sharon Byrd is a Professor of U.S. Law at the School of Law, Friedrich-Schiller University in Jena, Germany and Joachim Hruschka is a Professor of Law at Friedrich-Alexander University in Erlangen, Germany. The authors would like to thank the members of the workshop "Economics, Ethics and Law (Contractualism and the Ethics of Contracts)" at the IVR World Congress, May 24-29, 2005, in Granada, Spain, for their valuable comments on an earlier draft of this article, and particularly Hora- cio Spector, who also organized the event.