[Firms that intentionally increase leverage through substantial debt issuances do so primarily as a response to operating needs rather than a desire to make a large equity payout. Subsequent debt reductions are neither rapid, nor the result of proactive attempts to rebalance the firm's capital structure toward a long-run target. Instead, the evolution of the firm's leverage ratio depends primarily on whether or not the firm produces a financial surplus. In fact, firms that generate subsequent deficits tend to cover these deficits predominantly with more debt even though they exhibit leverage ratios that are well above estimated target levels. Our findings are broadly consistent with a capital structure theory in which financial flexibility, in the form of unused debt capacity, plays an important role in capital structure choices.]

Firms that intentionally increase leverage through substantial debt issuances do so primarily as a response to operating needs rather than a desire to make a large equity payout. Subsequent debt reductions are neither rapid, nor the result of proactive attempts to rebalance the firm’s capital structure toward a long-run target. Instead, the evolution of the firm’s leverage ratio depends primarily on whether or not the firm produces a financial surplus. In fact, firms that generate subsequent deficits tend to cover these deficits predominantly with more debt even though they exhibit leverage ratios that are well above estimated target levels. Our findings are broadly consistent with a capital structure theory in which financial flexibility, in the form of unused debt capacity, plays an important role in capital structure choices. (JEL G32) The search for an empirically viable capital structure theory has confounded financial economists for decades. Standard trade-off models of capital structure have been criticized on the grounds that they do a poor job of explaining observed debt ratios. For example, traditional trade-off models have difficulty explaining why firms tend to issue stock after exogenous decreases in leverage