“…In the transaction costs line of research, Williamson (1975Williamson ( , 1981) made important theoretical contributions, which have been empirically justified by various others (e.g., Hennart, 1988;Walker and Weber, 1984). In recent years resource-based arguments have been added to the explanation of outsourcing (Barney 1999;Leiblein, Reuer, and Dalsace, 2002;Marshall, McIvor, and Lamming, 2007) as have real options (Leiblein, 2003), agency (Holmström and Roberts, 1998) and industrial organisation arguments (Shy and Stenbacka, 2005). Thus a fairly good understanding has emerged as to what drives the decision to outsource, or integrate, a specific activity.…”