The main purpose of this study is to determine what are the main factors which stand behind the diversity in performance of business services measured by their contribution to growth in the EU Member States. We show that in addition to typical growth factors which enhance labour productivity,...

This paper discusses a model of vertical and horizontal product differentiation within the Dixit-Stiglitz framework of monopolistic competition. Firms compete not only in prices and horizontal attributes of their products, but also in the quality that can be controlled by R&D activities. Based...