Dissatisfied with the explanations of the business cycle provided by the Keynesian, monetarist, New Keynesian, and real business cycle schools, Edmund Phelps has developed from various existing strands--some modern and some classical--a radically different theory to account for the long periods of unemployment that have dogged the economies of the United States and Western Europe since the early 1970s. Phelps sees secular shifts and long swings...