In the last couple of decades, production processes have been characterized by their fragmentation, which crosses the borders of countries more and more. This coincides with the common viewpoint that products and services are now made in global value chains and that ‘trade in value added’...

Recent studies of border effects have focused on the intra-country and inter-country comparison of trade flows. It is found that borders have a negative impact on the size of cross-border trade. In order to estimate border effects on a regional level one needs not only data on inter-country but...