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- bonn: institute of labor economics (iza)39
- bonn: institute for the study of labor (iza)33
- institute for the study of labor (iza) bonn29
- munich: center for economic studies and ifo institute (cesifo)29
- berlin: deutsches institut fur wirtschaftsforschung (diw)13
- kalamazoo, mi: w.e. upjohn institute for employment research10
- koln: institut der deutschen wirtschaft (iw)8
- boston, ma: federal reserve bank of boston7
- duncker & humblot gmbh7