“…MFIs ownership forms environment" (Ménard& Shirley, 2008, p.1). Except the owner's desire to be himself master, owning is better than outsourcing because the firm internalizes the market transaction costs, i.e., the costs of observing and adjusting to market price mechanisms but also the costs involved by contracts incompleteness, by information asymmetry, by misalignments of contracting parties' interests, and by designing equitable incentive schemes (Coase, 1937;Williamson, 1971;Alchian & Demsetz, 1972;Grossman & Hart, 1986;Holmstrom & Tirole, 1989) namely when the legal system is perceived to inefficiently enforce contracts (Casas-Arce & Saiz, 2006;2010). Accordingly, the various institutional arrangements have been crafted so as to benefit from economies of scale (Coase, 1937) and of specialisation (Sraffa, 1926;Fama & Jensen, 1983a).…”