Banks face liquidity and capital pressures that favor selling off the loans they originate, but loan sales undermine their monitoring incentives. A bank’s loan default history is a noisy measure of its past monitoring choices, which can serve as a reputation mechanism to incentivize current monitoring. In equilibrium, higher reputation banks monitor (weakly) more intensively; if retention is credible, they generally retain less of the loans they originate. Monitoring is difficult to sustain in periods with uncommonly large spikes in loan demand (“booms”), especially for low-reputation banks, which are more likely to accommodate boom demand and forgo monitoring.

We examine the joint optimization of financial leverage and irreversible capacity investment in a real options framework with risky debt and endogenous interest costs. Higher capacity, ceteris paribus, increases operating leverage and default probability, but lowers ex post adjustment costs and generates larger tax shields. A key insight is that financial leverage and capacity are substitutes in the debt market equilibrium. We develop novel predictions about the effects of capital adjustment costs, operating costs, and uncertainty on optimal financial leverage and capacity that may potentially help explain ambiguous empirical results in the literature regarding the determinants of capital structure and investment. Received March 17, 2016; editorial decision July 8, 2017 by Editor Itay Goldstein.