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The main goal of this paper is to empirically examine the effects of related and unrelated variety on per employee income in Polish NUTS 2 regions, and the resulting income inequality. The study is based on regional panel data for the 2003–2018 period using the GMM estimator system. The positive effect of related variety on per employee income and the negative effect of unrelated variety on per employee income are reported. Our simulation results show that regional income inequality could be reduced by promoting related variety in eastern regions of the country. [ABSTRACT FROM AUTHOR]

The paper examines the effects of intra- and inter-regional knowledge spillovers on innovative activities in German states using the augmented Griliches-Jaffe knowledge production function. The "Harris market potential" type index is calculated to proxy for inter-regional knowledge transfers of two types: industrial knowledge transfers generated from the business enterprise sector and academic spillovers generated from universities across all German states. The model also includes the concentration of high-tech enterprises, in order to capture the agglomeration effect in the local economy. The estimation results reveal that not only do local private and university research efforts have a positive and significant effect on local innovative activities, but there are also important interregional knowledge spillovers across the German regions. [ABSTRACT FROM AUTHOR]