“…There exist many methodological approaches to convergence in economics [Bernardelli et al, 2017]: e.g., beta-convergence based on the growth theory [Solow, 1956], which occurs when poor countries/regions grow faster than rich ones (and catch up with them); and sigma-convergence, which refers to the reduction of disparities over time [Barro and Sala-i-Martin, 1992;Quah, 1993;Sala-i-Martin, 1996;later, e.g., Monfort, 2008;Young et al, 2008;Lessmann and Seidel, 2015], broken down into subgroups (club convergenceintroduced by Baumol, 1986, developed by, e.g., Durlauf andJohnson, 1995;Galor, 1996;Canova, 2004;Phillips and Sul, 2007;Alexiadis, 2012;Maynou et al, 2021;Ripollés, Vidal-Meliá, 2022).…”