Opportunism is self interest seeking with guile often involving subtle forms of deceit, especially calculated efforts to mislead, distort, disguise, obfuscate, or otherwise confuse. This vastly complicates the problems of economic organisation. Plainly if it were not for opportunism all behaviour could be rule governed
Oliver E. WilliamsonThe study of economic organization commonly proceeds as though market and administrative modes of organization were disjunct. Market organization is the province of economists. Internal organization is the concern of organization theory specialist. And never the twain shall meet.
Oliver E. Williamson