Robert A. Taggart, Jr., Rate-of-Return Regulation and Utility Capital Structure Decision, The Journal of Finance, Vol. 36, No. 2, Papers and Proceedings of the Thirty Ninth Annual Meeting American Finance Association, Denver, September 5-7, 1980 (May, 1981), pp. 383-393

This paper extends Merton Miller's 1977 analysis of corporate capital structure decisions to the incomplete capital markets case. As in Miller's model, aggregate demand for corporate leverage is curtailed as interest rates on taxable bonds rise. Unlike Miller's model, however, capital structure is not a matter of indifference to all equilibrium shareholders. Market incompleteness and tax arbitrage restrictions combine to prevent marginal rates of substitution from being equalized for all investors and hence their preferences are not unanimous. In addition, costs associated with debt induce a tendency for lower cost firms to issue a larger proportion of total corporate debt.

Financial economists typically assume that capital income uncertainty, derived from investments in uncertain returned marketable securities, represents the major source of household consumption uncertainty. But, for many households, if not most, labor income uncertainty dominates capital income uncertainty. This study analyzes households optimal reactions to labor income (human capital) uncertainty that is derived from the possibility of their wage earners' non–survival. By introducing a risk resolution mechanism—an insurance market—and allowing for the possibility that future tastes may be state–dependent, simple demand–for–insurance equations are mathematically derived to explicitly describe households optimal responses to human capital uncertainty.