In this paper we draw on recent progress in the theory of (1) property rights, (2) agency,
and (3) finance to develop a theory of ownership structure1 for the firm. In addition to tying
together elements of the theory of each of these three areas, our analysis casts new light on and
has implications for a variety of issues in the professional and popular literature including the
definition of the firm, the “separation of ownership and control,” the “social responsibility” of
business, the definition of a “corporate objective function,” the determination of an optimal capital
structure, the specification of the content of credit agreements, the theory of organizations, and the
supply side of the completeness of markets problems