“…Other authors propose a broader analysis of the location determinants of service sectors or functions: this is the case, for example, with Tomlin (2008) who examines fourteen service sectors; Defever (2006Defever ( , 2012 takes into account five production and service functions in the same time (headquarters, R & D, production, logistics, and sales and marketing), whereas Py and Hatem (2009) develop an analysis encompassing seven functions (production, headquarters, R & D, logistics, sales, delivery of services, and call centers).…”