The doctoral dissertation analyzes the impact of non - price factors on the competitiveness of eleven post - transition EU member states (Poland, Romania, Bulgaria, Croatia, Slovenia, the Czech Republic, Slovakia, Lithuania, Latvia, Estonia and Hungary) in the period from 4th quarter 2000 to the 2nd quarter 2020. The theoretical part of the paper presents the basic theories of competitiveness with special emphasis on the differentiation of price and non-price competitiveness. In the empirical part of the research, the sample of post-transition EU, member states showed that non-price competitiveness varied considerably in certain periods; so from 2000 to 2004 and from 2008 to 2011 post-transition countries grew at, a much faster of economic growth than the rest of the world and significantly slower in the last ten years. When testing the hypothesis of non-price factors, the methodology used includes, a combination of the Bayesian Model Average (BMA) and Weighted-Average Least Square (WALS) techniques. The research findings show that the sectoral structure of the economy with an emphasis on ICT is the most important driving force of non-price competitiveness in the long term. On the contrary, research findings show the negative influence of the aging of the population and the reduction of security on the non-price competitiveness of the post-transition countries of the European Union. Also, the results of the analysis partially confirm the positive influence of the country's image on non-price competitiveness, while the hypothesis about the influence of factors within countries was not confirmed.