This textbook provides a comprehensive and up to date review of the rapidly expanding business cycle literature. It covers three key strands of the theory which have dominated recent literature in the subject: equilibrium (monetary and real) business cycles, nonlinear business, cycle models and political business cycle theories. Business Cycles is designed for advanced undergraduate and postgraduate students of macroeconomics and monetary theory and policy and academic economists wishing to keep abreast of the substantial recent developments in this field.