“…The spatial aspects have been already incorporated, e.g., in many studies dealing with regional income convergence (Qin et al, 2017;Chocholatá and Furková, 2017;Lolayekar and Mukhopadhyay, 2019) at which it is assumed that spatial spillover effects will have a significant impact on income convergence of regions. Also, we can find several studies that handle issue of spatial heterogeneity and their results indicate that economic behaviour is unstable in space, and income convergence is characterized by multiple local equilibrium states -convergence clubs (Qin et al, 2017;Papalia and Betarelli, 2012;Pan et al, 2015;Furková, 2020).…”