"...none of the books on DEA that are available in the market today examines DEA from an economist's point of view. Subhash Ray's Data Envelopment Analysis is an exception. This book familiarizes the reader with the microeconomic foundations of the various DEA models that are currently available and widely used in the literature. Professor Ray explains the neo-classical production theory behind various DEA models. It is up-to-date and gives an excellent overview of DEA models from both empirical and theoretical points of view. Professor Ray is a leading authority on DEA. Every chapter of the book shows his mastery in the field. I am confident that the researchers at all levels working on DEA will immensely benefit from reading this book." Subal C. Kumbhakar, State University of New York, Binghamton