Professor Frans de Vries, PhD, and Bouwe Dijkstra, PhD, were visiting researchers at ZEW's Research Department "Environmental and Resource Economics, Environmental Management" from December 10 to 12, 2013. Frans de Vries is Professor in Economics with the Management School of the University of Stirling (UK). His research interests are at the intersection of environmental economics, the economics of technological innovation and industrial organization. Bouwe Dijkstra is Associate Professor with the School of Economics of the University of Nottingham (UK). His main interest is in environmental economics, particularly instruments of environmental policy, eco-innovation, political economy aspects as well as international trade and capital flows. During their stay, they were collaborating with ZEW researchers on a project on policy-induced stimulation of environmental R&D.