“…However, most studies refer to economic aspects (trade, competition, regional policy, tax policies and fiscal pressure, the labor market, industrial relations, the agriculture sector, banking regulations…) and above all, convergence on economic growth theory. There are important contributions in this field in the economics literature; see, for example, Cappelen et al (2003), Galor (1996), Luginbuhl and Koopman (2004), Próchniak and Witkowski (2013), Quah (1996), Vickerman et al (1999) or Williamson (1996).…”