“…The PLC trend is often assumed as a target rather than a descriptive and/or predictive model. For this reason, several authors focused on identifying key variables and related strategies relevant in each stage of PLC (e.g., Levitt, 1966;Catry and Chevalier, 1974;Hofer, 1975;Anderson and Zeithaml, 1984;Parker and Neelamegham, 1997;Narayanan et al, 2005;Moon, 2005). From this point of view, sales data are insufficient, since other information such as cross-elasticity between concurrent products, nature of demand (if first-purchase or replacement purchase), and so on, should be known (Midgley, 1981).…”