Brookings Papers on Economic Activity (BPEA) provides academic and business economists, government officials, and members of the financial and business communities with timely research on current economic issues. Contents: • Editors' Summary • The Increase in Income Cyclicality of High-Income Households and Its Relation to the Rise in Top Income Shares By Jonathan A. Parker and Annette Vissing-Jorgensen (Northwestern University) • The State of the Social Safety Net in the Post-Welfare Reform Era By Marianne P. Bitler (University of California, Irvine) and Hilary W. Hoynes (University of California, Davis) • The Impact of No Child Left Behind on Students, Teacheres, and Schools By Thomas S. Dee (University of Virginia) and Brian A. Jacob (University of Michigan) • How Useful Are Estimated DSGE Model Forecasts for Central Bankers? By Rochelle M. Edge (Board of Governors of the Federal Reserve System) and Refet S. Gürkaynak (Bilkent University) • Regulating the Shadow Banking System By Gary Gorton and Andrew Metrick (Yale University) • State Fiscal Policies and Transitory Income Fluctuations By James R. Hines, Jr. (University of Michigan)