1. Rheinisch-Westfälische Technische Hochschule (RWTH) Aachen University, Center for Economic Policy Research (CEPR), Center for Economic Studies and the Information and Forschung Institute (CESifo), and Information and Forschung (Ifo) Institute, Templergraben 64, Rm. 513, 52062 Aachen, Germany (e-mail: )
2. Ifo Institute, Ifo Center for Business Cycle Analysis and Surveys, Poschingerstrasse 5, 81679 Munich, Germany (e-mail: )
3. University of Notre Dame, National Bureau of Economic Research (NBER), and Ifo Institute, 710 Flanner Hall, Notre Dame, IN 46556 (e-mail: ).