“…Relatively instead to the computation of bank efficiency, departing from the asset model of Sealey Jr. and Lindley (1977), the choice of input and output vectors relies on a large economic literature which has been devoted to assess the efficiency of banking institutions (Mamatzakis et al, 2021; Mostak Ahamed et al, 2021; Prior et al, 2019; Tsionas & Andrikopoulos, 2020; Tsionas & Philippas, 2021) and on a stream of recent contributions which have dealt with the analysis of the efficiency of the Italian banking system (Amendola et al, 2021; Barra et al, 2016,b; Barra & Ruggiero, 2021b; Barra & Zotti, 2019; Coccorese & Ferri, 2020). Following this approach, 7 the output vector (y) comprises customer loans (y 1 ); services (administrative) or non‐traditional activities, that is, commission income and other operating income (y 2 ); and securities (y 3 ), that is, bank loans, Treasury bills, bonds and other debt less bonds and debt securities held by banks and other financial institutions.…”