“…For historical reasons, this strand of the literature has focused first on North America (see e.g., De Vany and Walls, 1993;King and Cuc, 1996;Serletis and Herbert, 1999;Cuddington and Wang, 2006;Park et al, 2008;Apergis et al, 2015) where in the mid-80's governments implemented several policies aimed at deregulating the market for natural gas. More recent are the contributions focusing on European gas markets (see e.g., Asche et al, 2002;Neumann et al, 2006;Robinson, 2007;Renou-Maissant, 2012;Growitsch et al, 2015;del Valle et al, 2017) or presenting international comparisons (Siliverstovs et al, 2005;Li et al, 2014).…”