“…Regions use their resources as efficiently as possible in order to achieve the objectives set by law, policy and social expectations, as they are all governed by elected regional authorities. These features make it possible to treat different regions as homogeneous, which enables their comparison using DEA [Żółtaszek, Olejnik, 2017]. Research by authors such as those listed below can be used as examples of regional analyses: Lafarga and Balderrama [2015] for Mexico, Buesa et al [2007] for Spain, Zabala-Iturriagagoitia et al [2007] and Żółtaszek and Olejnik [2017] for Europe, Dzemydaitė, Dzemyda and Galinienė [2016] for Central and Eastern Europe, and Chen and Guan [2012] for China.…”