Demonstrating a balanced treatment of both classical and Keynesian economics, Macroecomomics presents macroeconomic theory in a big-picture way. Comprehensive coverage makes it easy for readers to analyze real macroeconomic data used by policy makers and researchers. This text uses a unified approach based on a single economics model that provides readers with a clear understanding of macroeconomics and its classical and Keynesian assumptions. The Ninth Edition features new applications, boxes, and problems throughout and reflects recent events and developments in the field in light of recent crises in the United States and Europe.