[We study the interaction between financing and investment decisions in a dynamic model, where the firm has multiple debt issues and equityholders choose the timing of investment. Jointly optimal capital and priority structures can virtually eliminate investment distortions because debt priority serves as a dynamically optimal contract. Examining the relative efficiency of priority rules observed in practice, we develop several predictions about how firms adjust their priority structure in response to changes in leverage, credit conditions, and firm fundamentals. Notably, financially unconstrained firms with few growth opportunities prefer senior debt, while financially constrained firms, with or without growth opportunities, prefer junior debt. Moreover, lower-rated firms are predicted to spread priority across debt classes. Finally, our analysis has a number of important implications for empirical capital structure research, including the relations between market leverage, book leverage, and credit spreads and Tobin's Q, the influence of firm fundamentals on the agency cost of debt, and the conservative debt policy puzzle.]

We examine the link between the excess value of a diversified firm and the value of its internal capital market. Subsidies to small financially constrained segments with good relative investment opportunities significantly increase excess value, while transfers of resources from segments with good relative investment opportunities significantly decrease excess value. Of interest is that subsidies to small financially constrained segments with poor relative investment opportunities also significantly increase excess value. However, there is little evidence that this result depends on the diversity of a firm's investment opportunities. We conclude that financing constraints drive the relationship between the internal capital market and firm value.

We study the interaction between financing and investment decisions in a dynamic model, where the firm has multiple debt issues and equityholders choose the timing of investment. Jointly optimal capital and priority structures can virtually eliminate investment distortions because debt priority serves as a dynamically optimal contract. Examining the relative efficiency of priority rules observed in practice, we develop several predictions about how firms adjust their priority structure in response to changes in leverage, credit conditions, and firm fundamentals. Notably, financially unconstrained firms with few growth opportunities prefer senior debt, while financially constrained firms, with or without growth opportunities, prefer junior debt. Moreover, lower-rated firms are predicted to spread priority across debt classes. Finally, our analysis has a number of important implications for empirical capital structure research, including the relations between market leverage, book leverage, and credit spreads and Tobin's Q, the influence of firm fundamentals on the agency cost of debt, and the conservative debt policy puzzle.

We examine the link between the excess value of a diversified firm and the value of its internal capital market. Subsidies to small financially constrained segments with good relative investment opportunities significantly increase excess value, while transfers of resources from segments with good relative investment opportunities significantly decrease excess value. Of interest is that subsidies to small financially constrained segments with poor relative investment opportunities also significantly increase excess value. However, there is little evidence that this result depends on the diversity of a firm's investment opportunities. We conclude that financing constraints drive the relationship between the internal capital market and firm value.