“…Finally, when analysing the effect of LP practices on operational performance, different researchers (Cooney, 2002;De Toni and Tonchia, 1996;Fullerton et al, 2003;Inman and Mehra, 1990;Krafcik, 1988;Lowe et al, 1997;Williams et al, 1992Williams et al, , 1995 recommend using a series of different control variables, among which we would emphasise plant size, industry, product characteristics (manufacturability), vertical integration, capacity utilisation, model mix, automation level and market requirements. Yet in spite of the sector's importance both nationally and globally, very few studies have focused on analysing its importance for the world economy.…”