My research interests include:

* energy-economic issues

* economic growth and development

* the economics of cities and regions

* the role of culture in economic processes

Work in progress:

* Cross-Country Sectoral Energy Productivity Performance (with Henri de Groot)

* Dutch Energy Productivity in International Perspective (with Henri de Groot)

* The Economics of Zipf’s Law: a Meta-Analysis (with Henri de Groot)

* The Role of Culture and History in Explaining Regional Trade (with Pauline Grosjean and Gert-Jan Linders)