“…The most frequently used have been turnover (Oustapassidis, 1992;Trechter, 1996;Oustapassidis et al, 1998;Vidal et al, 2000;Hudson and Herndon, 2002;Montegut et al, 2002;Arcas and Ruiz, 2003) and assets (Lerman and Parliament, 1991;Barton et al, 1993;Fulton et al, 1995;Trechter, 1996;Vidal et al, 2000). Other, less frequently used measures include the number of members (Trechter, 1996;Hudson and Herndon, 2002), employees (Moyano and Fidalgo, 2001;Arcas and Ruiz, 2003) and storage capacity (Fulton and King, 1993). In this study, the measures of size used are: sales, total assets, material fixed assets, permanent employment, temporary employment, handling surface and numbers of members.…”