“…It covers, for instance, product superiority, product innovativeness, product uniqueness, relative price, relative quality, product variation, product flexibility, and conformance to standard [18,20,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57]. It covers, for instance, product superiority, product innovativeness, product uniqueness, relative price, relative quality, product variation, product flexibility, and conformance to standard [18,20,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57].…”