Jul 28 2014 Joachim Wagner   Extensive margins of imports, productivity and profitability: First evidence for manufacturing enterprises in Germany   Abstract  Contact Information  Citation  Full Text  -  Note   Apr 07 2009 François Langot and Coralia Quintero-Rojas   European vs American Hours Worked: assessing the role of the extensive and intensive margins   Abstract  Contact Information  Citation  Full Text  -  Note