"The NBER Macroeconomics Annuals" provide a forum for important debates in contemporary macroeconomics and major developments in the theory of macroeconomic analysis and policy. The papers and accompanying discussions in "NBER Macroeconomics Annual 2007", written by a group of top economists from a variety of fields, 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.