Authors
Jens Rommel
Department of Agricultural Economics, Humboldt-Universität zu Berlin
Christine Werthmann
christine.werthmann@hu-berlin.de
Department of Agricultural Economics, Humboldt-Universität zu Berlin

christine.werthmann@hu-berlin.de
© 2013 Jens Rommel, Christine Werthmann, published by Igitur Publishing
This work is licensed under the Creative Commons Attribution 4.0 License.