This paper examines the implications of some of the growing literature at the borderline of ethics and economics for development debates. It argues that this literature has already had considerable impact on development economics, particularly as a result of work on well-being and capabilities. Other areas where there has been considerable growth include population ethics and the area which explores the link between the contractarian tradition in moral philosophy and game theory. Work here has had less impact on development economics, and there is considerable scope for more work. Finally, both ethics and economics have been criticised for taking too abstract a view of human beings. Each has begun to take on this line of criticism and work which responds to it in various ways - such as by taking account of issues relating to identity, allowing for hard choices and fuzziness - is relevant to development.