Environmental pollution is introduced both as a joint product and as a source of disutility in growth models. The purpose is to explore vital questions such as: is environmental protection compatible with economic growth; is it possible to have sustained growth in the long run without...

The importance of knowledge spillovers for achieving innovation and economic growth is widely recognized. It is not straightforward which type of spillovers is most effective: intra-sectoral spillovers or inter-sectoral spillovers. We investigate this controversy using a model of regional...