“…Building on the commodity approach, other studies have further explored the efficiency dimension of relationship outcomes, and the added value that the end customer derives. Scholars who embrace the institutionalism approach have shifted the perspective from the manufacturer to the distributor, thus indicating specialization as a key source of efficiency (Alderson, 1954(Alderson, , 1957Artle & Berglund, 1959;Balderston, 1958). Functionalism research has broadened the scope of the analysis from the single dyad to a structural network of relationships within the distribution channel, seeking the key source of value creation (Bucklin, 1966;Mallen, 1973) and appropriation in the optimization of channel configurations (Bucklin, 1970;Corstjens & Doyle, 1979;McGuire & Staelin, 1983;Richartz, 1970;Zusman & Etgar, 1981).…”