Optimal Capital Structure,Endogenous Bankruptcy,and the Term Structure of Credit Spreads

This article examines the optimal capital structure of a firm that can choose both the amount and maturity of its debt. Bankruptcy is determined endogenously rather than by the imposition of a positive net worth condition or by a cash flow constraint. The results extend Leland's (1994a) closed-form results to a much richer class of possible debt structures and permit study of the optimal maturity of debt as well as the optimal amount of debt. The model predicts leverage, credit spreads, default rates, and writedowns, which accord quite closely with historical averages. While short term debt does not exploit tax benefits as completely as long term debt, it is more likely to provide incentive compatibility between debt holders and equity holders. Short term debt reduces or eliminates “asset substitution” agency costs. The tax advantage of debt must be balanced against bankruptcy and agency costs in determining the optimal maturity of the capital structure. The model predicts differently shaped term structures of credit spreads for different levels of risk. These term structures are similar to those found empirically by Sarig and Warga (1989). Our results have important implications for bond portfolio management. In general, Macaulay duration dramatically overstates true duration of risky debt, which may be negative for “junk” bonds. Furthermore, the “convexity” of bond prices can become “concavity.”     

Leverage Choice and Credit Spreads when Managers Risk Shift

We model the debt and asset risk choice of a manager with performance‐insensitive pay (cash) and performance‐sensitive pay (stock) to theoretically link compensation structure, leverage, and credit spreads. The model predicts that optimal leverage trades off the tax benefit of debt against the utility cost of ex‐post asset substitution and that credit spreads are increasing in the ratio of cash‐to‐stock. Using a large cross‐section of U.S.‐based corporate credit default swaps (CDS) covering 2001 to 2006, we find a positive association between cash‐to‐stock and CDS rates, and between cash‐to‐stock and leverage ratios.     

Capital structure,credit risk,and macroeconomic conditions

This paper develops a framework for analyzing the impact of macroeconomic conditions on credit risk and dynamic capital structure choice. We begin by observing that when cash flows depend on current economic conditions, there will be a benefit for firms to adapt their default and financing policies to the position of the economy in the business cycle phase. We then demonstrate that this simple observation has a wide range of empirical implications for corporations. Notably, we show that our model can replicate observed debt levels and the countercyclicality of leverage ratios. We also demonstrate that it can reproduce the observed term structure of credit spreads and generate strictly positive credit spreads for debt contracts with very short maturities. Finally, we characterize the impact of macroeconomic conditions on the pace and size of capital structure changes, and debt capacity.     

Does geopolitical uncertainty affect corporate financing? Evidence from MIDAS regression

This paper investigates the effect of geopolitical uncertainty on (market) leverage ratio, debt maturity, and choice of debt source. Using a new monthly index of geopolitical uncertainty and annual data for corporate financing variables, we find that under geopolitical uncertainty firms tend to reduce debt and increase market leverage. We argue that this increase is driven by asymmetrical reductions in the numerator (total debt) and the denominator (total debt and equity) of the leverage ratio. Under geopolitical uncertainty, firms tend to shorten their debt maturity structure and—especially those firms with lower credit quality—to substitute bank debt for public debt.     

Do Credit Spreads Reflect Stationary Leverage Ratios?

Most structural models of default preclude the firm from altering its capital structure. In practice, firms adjust outstanding debt levels in response to changes in firm value, thus generating mean-reverting leverage ratios. We propose a structural model of default with stochastic interest rates that captures this mean reversion. Our model generates credit spreads that are larger for low-leverage firms, and less sensitive to changes in firm value, both of which are more consistent with empirical findings than predictions of extant models. Further, the term structure of credit spreads can be upward sloping for speculative-grade debt, consistent with recent empirical findings.     

Dynamic debt runs and financial fragility: Evidence from the 2007 ABCP crisis

We use the 2007 asset-backed commercial paper (ABCP) crisis as a laboratory to study the determinants of debt runs. Our model features dilution risk: maturing short-term lenders demand higher yields in compensation for being diluted by future lenders, making runs more likely. The model explains the observed tenfold increase in yield spreads leading to runs and the positive relation between yield spreads and future runs. Results from structural estimation show that runs are very sensitive to leverage, asset values, and asset liquidity, but less sensitive to the degree of maturity mismatch, the strength of guarantees, and asset volatility.     

Growth options,macroeconomic conditions,and the cross section of credit risk

This paper develops a structural equilibrium model with intertemporal macroeconomic risk, incorporating the fact that firms are heterogeneous in their asset composition. Compared with firms that are mainly composed of invested assets, firms with growth options have higher costs of debt because they are more volatile and have a greater tendency to default during recession when marginal utility is high and recovery rates are low. Our model matches empirical facts regarding credit spreads, default probabilities, leverage ratios, equity premiums, and investment clustering. Importantly, it also makes predictions about the cross section of all these features.     

Rollover risk and credit risk under time-varying margin

For a firm financed by a mixture of collateralized (short-term) debt and uncollateralized (long-term) debt, we show that fluctuations in margin requirements, reflecting funding liquidity shocks, lead to increasing the firm’s default risk and credit spreads. The severity with which a firm is hit by increasing margin requirements highly depends on both its financing structure and debt maturity structure. Our results imply that an additional premium should be added when evaluating debt in order to account for rollover risks, especially for short-matured bonds. In terms of policy implications, our results strongly indicate that regulators should intervene fast to curtail margins in crisis periods and maintain a reasonably low margin level in order to effectively prevent creditors’ run on debt.     

Agency Costs, Risk Management, and Capital Structure

The joint determination of capital structure and investment risk is examined. Optimal capital structure reflects both the tax advantages of debt less default costs (Modigliani and Miller (1958, 1963)), and the agency costs resulting from asset substitution (Jensen and Meckling (1976)). Agency costs restrict leverage and debt maturity and increase yield spreads, but their importance is small for the range of environments considered. Risk management is also examined. Hedging permits greater leverage. Even when a firm cannot precommit to hedging, it will still do so. Surprisingly, hedging benefits often are greater when agency costs are low.     

The role of private equity group reputation in LBO financing

This paper investigates whether the reputation of acquiring private equity groups (PEGs) is related to the financing structure of leveraged buyouts (LBOs). Using a sample of 180 public-to-private LBOs in the US between January 1, 1997 and August 15, 2007, we find that reputable PEGs are more active in the LBO market when credit risk spreads are low and lending standards in the credit markets are lax. We also find that reputable PEGs pay narrower bank and institutional loan spreads, have longer loan maturities, and rely more on institutional loans. In addition, while we find that PEG reputation is positively related to buyout leverage (i.e., LBO debt divided by pre-LBO earnings before interest, taxes, and amortization (EBITDA) of the target), and leverage is significantly positively related to buyout pricing, we do not find any direct relation between PEG reputation and buyout valuations. The evidence suggests that PEG reputation is related to LBO financing structure not only because reputable PEGs are more likely to take advantage of market timing in credit markets and but also because PEG reputation reduces agency costs of LBO debt.     

How Entrenchment, Incentives and Governance Influence REIT Capital Structure

Although recent literature has confirmed the importance of viewing a firm??s capital structure choices of leverage and debt maturity as jointly determined, to date there has been little analysis of the importance of traditional governance variables on a firm??s capital structure decisions using a simultaneous equations approach. We examine the influence of managerial incentives, traditional managerial monitoring mechanisms and managerial entrenchment on the capital structure of Real Estate Investment Trusts (REITs). Using panel data, we estimate a system of simultaneous equations for leverage and maturity and find that firms with entrenched CEOs use less leverage and shorter maturity debt. This is consistent with the expectation that managers acting in their own self interest will choose lower leverage to reduce liquidity risk and use short maturity debt to preserve their ability to enhance their compensation and reputations by empire building. We also find evidence that traditional alignment mechanisms such as equity and option ownership have an offsetting effect; and that firms where the founder serves as CEO choose higher leverage and longer maturity debt. The results also provide evidence that leverage and maturity are substitutes, firms with high profitability and growth opportunities use less leverage and firms with liquid assets use more leverage and longer maturity debt.     

Investment timing and optimal capital structure under liquidity risk

Deterioration in debt market liquidity reduces debt values and affects firms' decisions. Considering such risk, we develop an investment timing model and obtain analytic solutions. We carry out a comprehensive analysis in optimal financing, default, and investment strategies, and stockholder–bondholder conflicts. Our model explains stylized facts and replicates empirical findings in credit spreads. We obtain six new insights for decision makers. We propose a ‘new trade-off theory’ for optimal capital structure, a new tax effect, and new explanations of ‘debt conservatism puzzle’ and ‘zero-leverage puzzle’. Failure in recognizing liquidity risk results in substantially over-leveraging, early bankruptcy or investment, overpriced options, and undervalued coupons and credit spreads. In addition, agency costs are surprisingly small for a high liquidity risk or a low project risk. Interestingly, the risk shifting incentive and debt overhang problem decrease with liquidity risk under moderate tax rates while they increase under high tax rates.     

Does debt capacity matter in the choice of debt in reducing the underinvestment problem?

We test the impact of debt capacity on firms’ simultaneous decisions of leverage and debt maturity in reducing underinvestment problems. Examining 24 OECD countries for the period between 1990 and 2011, we find strong evidence, that, unlike previous studies, the role of leverage and debt maturity in reducing underinvestment problems is not homogeneous across firms with varied debt capacity. We find new evidence that, when firms face lower debt capacity constraints, they benefit from their ability to use a greater amount of debt if they shorten their debt maturity, or gain from using longer maturity of debt if they decrease their leverage to reduce underinvestment problems. Our results suggest that they also benefit from the ability of their firms to gain from interest tax shields by financing more with debt or long-term debt, and hence use debt maturity and leverage as strategies substitutes. However, when firms are constrained by concerns over debt capacity, they tend to opt for a lower level of debt that is mainly short-term to reduce the underinvestment problem. Our results suggest that firms with lower debt capacity cannot completely resolve their underinvestment problems by using short-term debt or low leverage, implying that the effects of the liquidity risk outweigh those of underinvestment problems, and hence impose a constraint on firms’ choice of debt.     

The differential impact of leverage on the default risk of small and large firms

We analyse a sample of 6 million firm-year observations of large corporations and small and medium sized enterprises (SMEs) spanning 6 European countries from 2005 to 2015, to determine the impact of leverage and different sources of funding on default risk. We find that financial leverage has a greater impact on the probability of default of SMEs than of large corporations. The difference in default probability between the top and bottom leverage quartiles is 1.24% for large firms and 2.87% for SMEs. This difference may be explained by the greater exposure of SMEs to short-term debt and their consequently higher refinancing risk. Indeed, we find that SMEs that recover from the state of insolvency may have similar leverage to defaulted SMEs; however their liability structure is significantly altered towards long-term debt and away from short-term debt. Our findings have important implications not only for bank regulators and policy-makers but also for credit risk modelling.     

Managerial Stock Ownership and the Maturity Structure of Corporate Debt

This study documents that managerial stock ownership plays an important role in determining corporate debt maturity. Controlling for previously identified determinants of debt maturity and modeling leverage and debt maturity as jointly endogenous, we document a significant and robust inverse relation between managerial stock ownership and corporate debt maturity. We also show that managerial stock ownership influences the relation between credit quality and debt maturity and between growth opportunities and debt maturity.     

Leverage, options liabilities, and corporate bond pricing

The two major problems with typical structural models are the failure to attain a positive credit spread in the very short term, and overestimation of the overall level of the credit spread. We recognize the presence of option liabilities in a firm’s capital structure and the effect they have on the firm’s credit spread. Including option liabilities and employing a regime switching interest rate process to capture the business cycle resolves the above-mentioned drawbacks in explaining credit spreads. We find that the credit spread overestimation problem in one of the structural models, Collin-Dufresne and Goldstein (J Finan 56:1929–1957, 2001), can be resolved by combining option liabilities and the regime-switching interest rate process when dealing with an investment grade bond, whereas with junk bonds, only the regime-switching interest rate process is needed. We also examine vulnerable option values, debt values, and zero-coupon bond values with different model settings and leverage ratios.      

A model of dynamic compensation and capital structure

This paper studies the optimal compensation problem between shareholders and the agent in the Leland (1994) capital structure model, and finds that the debt-overhang effect on the endogenous managerial incentives lowers the optimal leverage. Consistent with data, our model delivers a negative relation between pay-performance sensitivity and firm size, and the interaction between debt-overhang and agency issue leads smaller firms to take less leverage relative to their larger peers. During financial distress, a firm's cash flow becomes more sensitive to underlying performance shocks due to debt-overhang. The implications on credit spreads and debt covenants are also considered.     

Liquidity and Credit Risk

We develop a structural bond valuation model to simultaneously capture liquidity and credit risk. Our model implies that renegotiation in financial distress is influenced by the illiquidity of the market for distressed debt. As default becomes more likely, the components of bond yield spreads attributable to illiquidity increase. When we consider finite maturity debt, we find decreasing and convex term structures of liquidity spreads. Using bond price data spanning 15 years, we find evidence of a positive correlation between the illiquidity and default components of yield spreads as well as support for downward‐sloping term structures of liquidity spreads.     

Evaluating corporate credit risks in emerging markets

Corporate leverage among emerging market firms went up considerably after the 2007–09 Global Financial Crisis (GFC). We investigate how the increased emerging market corporate leverage in the post-GFC period (2010–15) impacted the underlying credit risk, compared to the pre-GFC (2002–2006) and GFC (2007–09) periods. Using firm-level credit risk, financial, and balance sheet data for 350 firms in 23 emerging markets, we find that leverage growth leads to a significant increase in corporate credit default swap (CDS) spreads only in the post-GFC period, and the incremental effect is mainly evident among risky firms (firms with high leverage and idiosyncratic volatility). In contrast, emerging market CDS spreads during the GFC period are mainly driven by global market risk factors. The post-GFC corporate debt vulnerability is mitigated for high growth prospect firms and firms domiciled in countries with high net capital inflows and superior governance. While corporate leverage growth impacts aggregate corporate credit risk, there is no evidence that it increases sovereign credit risk. Our paper contributes to the recent literature on potential sources of default risk in emerging markets.     

The Determinants of Debt Maturity at Issuance: A System-Based Model

We examine the determinants of corporate debt maturity while taking into account the interdependent relation between maturity and leverage. We do this by estimating a simultaneous-equations model on debt maturity and leverage for a sample of bond-issuing firms. To compare with previous studies, we also estimate a single-equation model on debt maturity using OLS. We define debt maturity as either the maturity of bonds at issuance (incremental approach), or the percentage of a firm's total debt that matures in more than three years (balance-sheet approach). Corroborating the findings of many previous studies, our single-equation OLS results support the underinvestment hypothesis purporting that firms with greater growth opportunities have shorter-term debt. However, under the simultaneous-equations model, the negative relation between a firm's debt maturity and its growth opportunities ceases to hold. Instead, it is the leverage decision that is influenced by growth opportunities. This suggests that existing models may overestimate the effect of growth opportunities on debt maturity.