Economists enjoy enormous influence over the life chances of the world's inhabitants, yet do not receive, at any point in their training, any exposure to the professional ethical challenges that their work entails. This lack of attention to professional ethics means that even well-meaningeconomists will take actions that can cross ethical lines, to the detriment of those whom they seek to serve. The Economist's Oath seeks to initiate a serious conversation among economists about the ethical content of their work, by raising fundamental questions on the nature of what economists do, the reception that ethics has historically had in the profession and why, how this reception is dangerous forall parties involved, the lessons to be drawn from other professions with advanced professional ethics, the principles that could emerge from professional economics ethics, and the kinds of reform in economic education that might be implied by a commitment to professional ethics. The book does not present an ethical expose or seek to embarrass the profession or individual economists, nor does it seek to lay down an ethical law for the profession. Instead, it more modestly but more importantly advances the case for the inauguration of a new tradition of inquiry. DeMartinoargues that critical inquiry by economists into professional economic ethics would enhance the quality of the services that the profession offers, might help to prevent avoidable and consequential errors and could provide the communities that economists serve with a standard to which economistscould be held accountable.