Whether corporate diversification increases or destroys firm value has been the subject of extensive investigation in the finance literature. Earlier evidence generally shows that diversified firms sell at a discount relative to focused firms and suggests that diversification destroys share value (e.g., Lang and Stulz, 1994; Berger and Ofek, 1995). Recent studies have argued, however, that diversification per se does not cause a discount (e.g., Graham et al. (1999); Lamont and Polk (1999); Villalonga (2004); Campa and Kedia (2001)). Using a plant-level database that covers the entire U.S. economy, Villalonga (2005) even finds that diversified firms are traded at significant premia compared to focused firms in the same industry.
A corporation embeds the claims of various stakeholders including shareholders, managers, and creditors and each group may attach a different value to diversification. For example, managers may value diversification because it allows them to have greater discretion on the firm’s cash flows by creating an internal capital market, and because it reduces the potential risk in managerial compensation linked to the firm’s overall performance. Or, diversification may be of value for equity-holders if they are able to diversify their own individual investment portfolios only at higher cost. While substantial evidence has accumulated on the effect of corporate diversification on equity holders and on managerial behavior, little is known about creditors’ assessment of the merits of corporate diversification.