The NBER Macroeconomics Annual provides a forum for important debates in contemporary macroeconomics and major developments in the theory of macroeconomic analysis and policy that include leading economists from a variety of fields. The papers and accompanying discussions in NBER Macroeconomics Annual 2007 address exchange-rate models; implications of credit market frictions; cyclical budgetary policy and economic growth; the impacts of shocks to government spending on consumption, real wages, and employment; dynamic macroeconomic models; and the role of cyclical entry of new firms and products on the nature of business-cycle fluctuations and on the effects of monetary policy.About the Author: Daron Acemoglu is the Charles P. Kinderberger Professor of Applied Economics at the Massachusetts Institute of Technology and a research associate of the NBER. Kenneth Rogoff is the Thomas D. Cabot Professor of Public Policy and professor of economics at Harvard University and a research associate of the NBER. Michael Woodford is the John Bates Clark Professor of Political Economy at Columbia University and a research associate of the NBER.