Book excerpt: "Economics will never be able to move beyond these vague predictions because it treats human behavior - individual and social - as the product of expectations and preferences - beliefs and desires - the variables that cannot be measured independently of the actual choices we want to predict. These factors, combined with the economist's commitment to the search for equilibrium solutions to theoretical problems, condemn economic theory to permanent predictive weakness. In the end, Rosenberg's analysis is not merely a critique. His aim is to redefine the scope and value of neoclassical theory, suggesting that its character and most important accomplishments need to be correctly understood to defend economics against the charge that it is a science of diminishing returns."--BOOK JACKET.