Martin C. Schmalz is Assistant Professor of Finance at the University of Michigan Ross School of Business. This post is based on a recent paper by Professor Schmalz. Related research from the Program on Corporate Governance includes Horizontal Shareholding (discussed on the Forum here) and The Growing Problem of Horizontal Shareholding (discussed on the Forum here), both by Einer Elhauge; and The Agency Problems of Institutional Investors, by Lucian Bebchuk, Alma Cohen, and Scott Hirst.
A fast-growing literature in finance and industrial organization studies whether and how “common ownership” links affect firm behavior and market outcomes. A new forthcoming paper, available on SSRN, reviews the rich history of thought on this topic. In addition to connecting the existing contributions in the economics and finance literature, the review also points to previous contributions in antitrust law, and offers ideas for future research.
Conceptually, the literature revolves around the question of what is the objective of the firm. Harvard’s Oliver Hart pointed out in the late 1970s that unless firms are price takers or all shareholders have their wealth concentrated in a single firm—and no other interests—shareholders don’t generally agree that the firm’s optimal strategy is to maximize its own value.