The crisis has forced economists and policy makers to go back to their drawing boards. Where did they go wrong, and what implications does the crisis have for both macroeconomic theory and macroeconomic policy making? This was the topic of this year’s IMF Jacques Polak Research Conference. The twelve papers presented at the conference provided rich fodder for discussion. Here, Olivier Blanchard shares some flavor of the major themes, including: (i) the increased attention to fiscal policy; (ii) the scope for monetary policy to lessen the adverse ‘real economy’ effects of financial disruptions; (iii) the role of international capital flows in weakening financial stability; and (iv) the prominence of regulatory issues and the interplay with the real economy.