“…This assumption is likely to be very restrictive regarding public subsidies, since it is theoretically demonstrated that public subsidies may influence the inputoutput space (see Hennessy, 1998;Serra et al, 2006;Ciaian and Swinnen, 2009). Second, likely to account for this theoretical fact, a number of papers, using SFA or DEA, model subsidies as input or as output (see Silva et al, 2004;Hadley, 2006;Kroupová and Malý, 2010;Malá et al, 2011;Trnková et al, 2012;Rasmussen, 2010;Silva and Marote, 2013;Mamardashvili et al, 2016).…”