"This is a fscinating book. In it the authors report the results of years of research testing the basic propositions of economic theory on animals, primarily rats and pigeons....Who should read this book? As indicated previously it can be read profitably by students in introductory courses. Any economist willing to consider truly original and creative applications of economic theory and experimental methodology should be intrigued by this book....one cannot help but marvel at the ability of a theory which was developed by introspective consideration of how we make choices to explain complicated behavior of other species." David Grether, Journal of Economic Literature