Book excerpt: "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 - Democratic Change in the Arab World, Past and Present Eric Chaney (Harvard University) - Disentangling the Channels of the 2007-2009 Recession James Stock (Harvard University) and Mark Watson (Princeton University) - Macroeconomic Effects of FOMC Forward Guidance Jeffrey Campbell, Charles Evans, Jonas Fisher, and Alejandro Justiniano (Federal Reserve Bank of Chicago) - Is the Debt Overhang Holding Back Consumption? Karen Dynan (Brookings Institution) - The Euro's Three Crises Jay Shambaugh (Georgetown University) - Fiscal Policy in a Depressed Economy J. Bradford DeLong (University of California-Berkeley) and Lawrence Summers (Harvard University )