“…However, in general, it is possible to identify quite huge regional disparities in individual EU regions regarding especially the socio-economic indicators, for example, GDP per capita, attained education level, migration and (un)employment rate. It is worth mentioning that in this context are very popular various analyses dealing with problems of convergence (see, e.g., Elias & Rey, 2011;Makrevska Disoska, 2016;Notermans, 2015;Paas & Schlitte, 2009).…”