The zero-leverage phenomenon: A bivariate probit with partial observability approach

The empirical literature on zero leverage investigates why some firms are debt-free using standard logit and probit specifications. However, such models are not suitable to provide a direct answer to the main research question that arises in this context: is zero leverage a financial decision of the firm or an imposition raised by creditors? This paper examines the factors that affect the demand for debt and the supply of debt using bivariate probit models with partial observability in the sense of Poirier (1980), providing empirical evidence on the zero-leverage phenomenon for European listed firms during the period 2001-2016. We find that some variables influence in opposite directions debt demand and supply, or affect significantly only of them. In particular, firms’ profitability affects negatively debt demand but positively debt supply; asset tangibility increases the willingness of creditors to grant debt but does not influence debt demand; and the recent European crises reduced the propensity of firms to resort to debt but did not affect debt supply. We also find that firms in countries with common law systems, market-based financial systems and stronger protection to investors’ and creditors’ rights are more prone to have zero leverage due to both demand and supply effects.     

The international zero-leverage phenomenon

We analyze the zero-leverage phenomenon around the world. Countries with a common law system, high creditor protection, and a dividend imputation or dividend relief tax system exhibit the highest percentage of zero-leverage firms. The increasing prevalence of zero-leverage firms in all sample countries is related to market-wide forces during our sample period, such as IPO waves, shifts in industry composition, increasing asset volatility, and decreasing corporate tax rates. Firm-level comparisons reveal that only a small number of firms deliberately maintain zero-leverage. Most zero-leverage firms are constrained by their debt capacity. Analyzing the time-series dynamics of leverage and investment behavior, we further show that firms which pursue a zero-leverage policy only for a short period of time seek financial flexibility.     

The mystery of zero-leverage firms

We present the puzzling evidence that, from 1962 to 2009, an average 10.2% of large public nonfinancial US firms have zero debt and almost 22% have less than 5% book leverage ratio. Zero-leverage behavior is a persistent phenomenon. Dividend-paying zero-leverage firms pay substantially higher dividends, are more profitable, pay higher taxes, issue less equity, and have higher cash balances than control firms chosen by industry and size. Firms with higher Chief Executive Officer (CEO) ownership and longer CEO tenure are more likely to have zero debt, especially if boards are smaller and less independent. Family firms are also more likely to be zero-levered.     

To be or not to be all-equity for firms that eliminate long-term debt

Despite the advantages of debt, a significant number of firms that have an established leverage policy deliberately become all-equity. These firms eliminate a substantial amount of long-term debt as the average firm’s leverage ratio is approximately 30 percent at the year-end prior to debt elimination. Firm-level “shocks” such as CEO turnover and changes in credit ratings cannot explain the dramatic recapitalization decision. Consistent with the tradeoff theory, firms that eliminate debt have lower benefits (less tax shield benefits, agency costs) and higher costs (probability of financial distress, access to capital markets, etc.) of leverage in the three prior years compared to a matched sample. We also find that the factors influencing the decision to eliminate all debt is different from those to significantly reduce leverage or to have very low debt levels. Firms primarily finance the approximately $70 million of average long-term debt eliminated using proceeds from sales of relatively unproductive assets and from equity issues. Interestingly, over half of these firms issue significant amount of new debt within three years of becoming all-equity. Firms with lower liquidity and non-debt tax shields, higher potential overinvestment agency costs, and those that issue equity at the debt elimination year are more likely to relever quickly.     

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.     

Leverage change,debt overhang,and stock prices

We document a significant and negative effect of the change in a firm's leverage ratio on its stock prices. We find that the negative effect is stronger for firms that have higher leverage ratios, higher likelihood of default, and face more severe financial constraints. Moreover, firms with an increase in leverage ratio tend to have less future investment. These findings are consistent with Myers' (1977) debt overhang theory that an increase in leverage may lead to future underinvestment, thus reducing a firm's value.     

OPERATING LEVERAGE AND UNDERINVESTMENT

Using a contingent claims model, we examine the impacts of both operating leverage and financial leverage on a firm's investment decisions in the context of capacity expansion. Our model shows that quasi‐fixed operating costs could significantly mitigate the underinvestment problem for debt‐financed firms. The existing debt induces equity holders to delay equity‐financed expansion because the expanded earnings base will also benefit the debt holders by lowering the bankruptcy risk. The operating costs decrease this type of wealth transfer from equity holders to debt holders by magnifying the bankruptcy risk of the existing debt upon investment. By applying the Cox proportional hazard model on a large sample of publicly traded U.S. firms over 1966–2016, we offer empirical support for the theoretical predictions. The results are robust to various measures of operating leverage.     

Societal trust and corporate underinvestment

We extend prior literature by showing that societal trust is a significant determinant of corporate investment policy. Firms in countries with a higher level of societal trust are less prone to underinvestment. We posit that the association between trust and underinvestment relates to a reduction of financial constraints. However, when we split our sample using different proxies for the level of financial constraints, we document that trust has an additional effect on underinvestment beyond enhanced access to capital. Consistent with the view that trust and conventional forms of governance are substitutes, we demonstrate that the effect of trust on underinvestment is reduced for firms in countries with strong investor protection.     

Zero leverage puzzle: Do labour laws matter?

Exploiting the staggered passage of labour protection laws in the United States, we find that higher labour adjustment costs increased the likelihood of observing zero leverage firms by 22%. This effect is significantly larger in states with stronger unionization, in industries with higher volatility and concentration, and in firms with higher labour intensity. Both within-firm changes in debt policies and higher propensity of newer firms to be debt-free are important in explaining these patterns. Overall, our work contributes to the literature on the relation between financial and labour markets by highlighting the role of labour laws in explaining the zero-leverage puzzle.     

Financial leverage changes associated with corporate mergers

We empirically examine whether firms increase financial leverage following mergers. Firms could increase financial leverage either because of an increase in debt capacity or because of unused debt capacity from pre-merger years. We find that financial leverage of combined firms increases significantly following mergers. A cross-sectional analysis shows that the change in financial leverage around mergers is significantly positively correlated with the announcement period market-adjusted returns. Further tests indicate that the increase in financial leverage is an outcome of an increase in debt capacity, although there is weak evidence that some of the increase in financial leverage is a result of past unused debt capacity.     

Debt enforcement,financial leverage,and product failures: Evidence from China and the United States

Building on capital structure and product market interactions, and the role of debt enforcement in leveraged firms' investments, we examine whether cross-country debt enforcement can produce different associations between financial leverage and product failures. Results show that different debt enforcement systems can generate opposite leverage effects. In countries with weak/nearly ineffective debt enforcement, financial leverage shows an incentive investment effect due to low default costs, and thus highly leveraged firms tend to invest more and are less likely to have product failures. Conversely, in countries with strict/effective debt enforcement, distressed companies tend to have an underinvestment effect and more product failures.     

Government lending in a crisis

The economic disruption from the COVID-19 pandemic prompted governments around the world to initiate an unprecedented number of temporary lending and tax deferment programs. Which firms will benefit from these programs? What are the implications for firm balance sheets and post-crisis survival? We provide some novel insights on these questions by studying one of the first government programs of this type, which Sweden launched at the height of the 2008–2009 financial crisis. The Swedish program allowed firms to temporarily suspend payment of all labor-related taxes and fees, treating these deferred amounts as a short-term loan from the government. Firms participating in the program are younger, less profitable, hold fewer cash reserves, are more leveraged, and have less unused slack in their credit lines when the crisis hits. Given the structure of the Swedish program, it provided more liquidity to firms with relatively larger ex ante wage bills. Exploiting this feature of the policy, we find that firms use the program to increase overall debt levels rather than to substitute for other borrowing. The leverage increase is due entirely to higher levels of non-bank debt. Firms use the funds to avoid making even deeper cuts to current assets. Despite the increase in leverage, access to the lending program is unrelated to the likelihood a firm files for bankruptcy and is negatively related to the likelihood a firm encounters severe financial distress in the years immediately following the crisis.     

Financial Flexibility,Investment Ability,and Firm Value: Evidence from Firms with Spare Debt Capacity

We document, for the first time, that a conservative leverage policy directed at maintaining financial flexibility can enhance investment ability. Our analysis reveals that following a period of low leverage, firms make larger capital expenditures and increase abnormal investment. We find that these new investments are financed through new issues of debt. The impact of financial flexibility is both statistically significant and economically sizable. Further, long-run performance tests reveal that financially flexible firms not only invest more but also invest better. Our results are consistent with the view that financial flexibility in the form of untapped reserves of borrowing power is a crucial missing link in capital structure theory.     

Refinancing Risk and Cash Holdings

We find that firms mitigate refinancing risk by increasing their cash holdings and saving cash from cash flows. The maturity of firms’ long‐term debt has shortened markedly, and this shortening explains a large fraction of the increase in cash holdings over time. Consistent with the inference that cash reserves are particularly valuable for firms with refinancing risk, we document that the value of these reserves is higher for such firms and that they mitigate underinvestment problems. Our findings imply that refinancing risk is a key determinant of cash holdings and highlight the interdependence of a firm's financial policy decisions.     

Industry conditions,growth opportunities and market reactions to convertible debt financing decisions

Firms that issue convertible debt have high debt- and equity-related costs of external finance. Existing theories of convertible debt finance differ primarily in their identification of the specific causes of the debt- and equity-related costs of external finance. To assess the theoretical issuance motives separately, we propose a simple framework that characterizes how issuers should design convertible debt to efficiently mitigate specific debt- and equity-related costs of external finance. We provide evidence from 588 security offer announcements that supports the hypotheses that: (1) convertible debt can be designed to mitigate different combinations of debt- and equity-related costs of external finance and (2) share price reactions depend on the security design decisions. The results also illustrate that the relations between firm value, financial leverage, investment opportunities, and the rate of future growth are more complex among convertible debt issuers than situations where firms issue standard financial securities.     

Financially Constrained Stock Returns

We study the effect of financial constraints on risk and expected returns by extending the investment-based asset pricing framework to incorporate retained earnings, debt, costly equity, and collateral constraints on debt capacity. Quantitative results show that more financially constrained firms are riskier and earn higher expected stock returns than less financially constrained firms. Intuitively, by preventing firms from financing all desired investments, collateral constraints restrict the flexibility of firms in smoothing dividend streams in the face of aggregate shocks. The inflexibility mechanism also gives rise to a convex relation between market leverage and expected stock returns.     

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.     

Why are firms unlevered?

In this paper, we examine why firms have no debt in their capital structure. We reject the hypothesis that zero-leverage policies are driven by entrenched managers attempting to avoid the disciplinary pressures of debt. These firms do not have weaker internal or external governance mechanisms. The debt initiation decisions of these firms are not preceded by shocks to their entrenchment, such as takeover threats or the emergence of activist blockholders. Our evidence supports the hypothesis that these firms are financially constrained. Zero-debt firms are small, young, conserve cash from cash-flow, and are more likely to lease their assets. When they have access to a line of credit, they face stricter covenants and higher all-in costs than comparable control firms. They lose market share in economic downturns, consistent with the financial constraints explanation, but inconsistent with theories of predation which suggest that they may be voluntarily stockpiling debt capacity.     

The value of financial flexibility and corporate financial policy

We propose a novel approach to measure the value that shareholders assign to financial flexibility. In contrast to existing proxies for financial constraints, our measure is market-based, forward-looking and not directly influenced by past financial decisions. We find that firms for which shareholders consider financial flexibility more valuable have lower dividend payouts, prefer share repurchases to dividends, and exhibit lower leverage ratios. Moreover, these firms tend to accumulate more cash. Our analysis contributes to the growing literature on financial flexibility and indicates that—in line with prior survey evidence—financial flexibility considerations shape corporate financial policy.     

The Net Benefits to Leverage

I estimate the market's valuation of the net benefits to leverage using panel data from 1994 to 2004, identified from market values and betas of a company's debt and equity. The median firm captures net benefits of up to 5.5% of firm value. Small and profitable firms have high optimal leverage ratios, as predicted by theory, but in contrast to existing empirical evidence. Companies are on average slightly underlevered relative to the optimal leverage ratio at refinancing. This result is mainly due to zero leverage firms. I also look at implications for financial policy.