Publications

Recent Publications

  • Aretz, Kevin, Ming-Tsung Lin, and Ser-huang Poon, Moneyness, Underlying Asset Volatility, and the Cross-Section of Option Returns, forthcoming in the Review of Finance.

Prior studies show that, in models in which the value of an asset is exogenously determined, the asset's volatility has an unambiguous effect on the expected returns of European options written on the asset. Using a stochastic discount factor model, we show that this is not the case when the value of the asset is endogenously determined. In our model, the effect of volatility on expected option returns hinges on whether volatility is systematic or idiosyncratic and on the moneyness of the option. While an increase in idiosyncratic volatility only affects option elasticity, leading idiosyncratic volatility to be unambiguously priced, an increase in systematic volatility also has an oppositely-signed effect on the expected underlying asset return, with option moneyness determining which effect prevails. Our empirical analysis supports these prediction, suggesting that idiosyncratic volatility unambiguously prices European call options, while systematic volatility positively (negatively) prices in-the-money (out-of-the-money) European call options.


  • Aretz, Kevin, Maria Marchica, and Murillo Campello, Access to Collateral and the Democratization of Credit: France's Reform of the Napoleonic Security Code, The Journal of Finance 75, 45-90.

We study whether a recent French collateral reform, Ordonnance 2006-346, led to a democratiaztion of credit access across France. The reform updated security laws put into place by Napoleon in 1804, enabling firms for the first time to pledge hard assets without dispossession, to pledge fungible and/or future assets, and to utilize rechargeable security interests. The reform was, however, undermined by non-codified laws from the 1970/80s, allowing firms to pledge liquid assets to factoring companies. Using differences tests, we show that firms operating mostly hard assets and located far away from factoring companies significantly raised their leverage after the reform, with the proportion of zero long-term leverage firms among them dropping from 90% to 30%. We further show that small, profitable, and start-up firms benefitted the most. Spatial points analysis suggests the reform reached firms in rural areas, reducing capital access inequality across the country.

  • Aretz, Kevin, Shantanu Banerjee, and Oksana Pryshchepa, In the Path of the Storm: Does Financial Distress Cause Industrial Firms to Risk-Shift?, Review of Finance 23, 1115-1154.

While recent studies have shown that exogenous distress risk increases can prompt industrial firms to take on more risk, they offer only limited evidence on whether this behavior hurts creditors, leaving it unclear whether the risk-taking translates into risk-shifting. In our paper, we show that moderately, but not highly, distressed firms increase the risks of their operating segment portfolios in response to exogenous distress risk increases induced through hurricane strikes. The higher risk is facilitated through closing down low-risk segments with high growth opportunities, boosting ex-post failure risk. We also show that creditor control facilitated through covenant violations keeps the most highly distressed firms from raising their risk. Our paper is first in showing that firms' risk-taking behavior in high distress risk situations can amount to risk-shifting.

  • Aretz, Kevin, and Peter Pope, 2018, Real Options Models of the Firm, Capacity Overhang, and the Cross-Section of Stock Returns, The Journal of Finance 73, 1363-1415.

Real options models of the firm often suggest that the difference between a firm's installed production capacity and its optimal capacity ("capacity overhang") conditions stock returns, although it is unclear what the exact shape of the relation is. Models with highly or completely irreversible investments, for example, often suggest a positive or U-shaped relation, whereas models with more reversible investments often suggest a negative relation. In our paper, we employ a stochastic frontier model to estimate stock-level capacity overhang. Using the capacity overhang estimate in portfolio sorts and Fama-MacBeth regressions, the data suggests that the stock return-capacity overhang relation is monotonically negative, supporting real options models of the firm with more reversible investments. Further supporting these real options models, capacity overhang helps explain momentum and profitability anomalies, but not value and investment anomalies.

An updated capacity overhang estimate is available from the "Data" section on this website.

  • Aretz, Kevin, Chris Florackis, and Alexandros Kostakis, Do Stock Returns Really Decrease with Default Risk? New International Evidence, Management Science 63, 3821-3842.

Prior empirical studies, such as Dichev (1998), Garlappi et al. (2008), and Campbell et al. (2008), report a flat, negative, or hump-shaped relation between default risk and the cross-section of U.S. stock returns. Constructing a novel dataset of bankruptcy filings for firms in 14 developed non-U.S. countries, we use Campbell et al.'s (2008) logit/hazard model approach to recursively estimate default risk for the firms in these countries. Using the default risk estimates in asset pricing tests, we report a monotonically positive default risk-stock return relation outside of the United States, which is statistically and economically significant. Decomposing default risk into its systematic and idiosyncratic components, we show that the systematic component is responsible for the positive default risk-stock return relation. We also show that the default risk-stock relation is more positive in countries in which bargaining power is skewed towards creditors and away from shareholders.

Older Publications

  • Aretz, Kevin, and Marc Aretz, 2016, Which Stocks Drive the Size, Value, and Momentum Effects? Evidence From a Statistical Leverage Analysis, Financial Market and Portfolio Management 30, 19-61.

We use a statistical leverage method to identify those stocks driving the size, book-to-market, and momentum premia in Fama-MacBeth (1973) regressions of stock returns on the stock characteristics. We document that a surprisingly small number of stocks (often less than 1%) are responsible for the anomalies. We further show that the responsible stocks are often volatile, perhaps signalling limits to arbitrage. Persistence tests suggest that the identity of the stocks driving the anomalies changes rapidly over time.

  • Oksana Pryshchepa, Kevin Aretz, and Shantanu Banerjee, 2013, Can Investors Restrict Managerial Behavior in Distressed Firms?, Journal of Corporate Finance 23, 222-239.

We study the risk-shifting behavior of firms approaching bankruptcy, investigating whether these firms raise managerial compensation, increase shareholder payouts, and speed up investments in response to positive uncertainty shocks. Our results suggests that only those firms not known to be in distress before their bankruptcy (i.e., those with a high Z-score or distance-to-default) engage in such activities. Studying why the firms known to be in distress do not engage in them, we offer evidence that creditor control facilitated through covenant violations keeps them from doing so. Studying how the risk-shifting firms hide their distress, we offer evidence that the firms pursue more aggressive accounting policies and manipulate their earnings.

  • Aretz, Kevin, and David Peel, 2013, An Example of an Optimal Forecast Exhibiting Decreasing Bias with Increasing Forecast Horizon, Bulletin of Economic Research 65, 362-371.

We study optimal forecasts under a target-zone loss function, motivated using the example of a central banker in an inflation zone. We derive the optimal forecast of a non-normal (Rayleigh) random variable under that loss function, showing that the optimal forecast is biased. We also show that the optimal bias does not necessarily monotonically increase with the forecasting horizon, giving examples in which the optimal bias either decreases or first increases and then decreases with the forecasting horizon.

  • Aretz, Kevin, and Peter Pope, 2013, Common Factors in Default Risk Across Countries and Industries, European Financial Management 19, 108-152.

We use the method of Marsh and Pfleiderer (1997) to decompose changes in firms' default risk, extracted from Merton's (1974) model or credit default swaps (CDS) data, into global, country, and industry components. In line with intuition, we show that changes in default risk are dominated by global, and not domestic, factors. We, however, further show that domestic factors become more important -- and often dominant -- in expansion periods. Interestingly, cross-sectional asset pricing tests suggest that stock markets tend to price the domestic component of changes in default risk, while not pricing the global components.

  • Aretz, Kevin, and Mark Shackleton, 2011, Omitted Debt Risk, Financial Distress, and the Cross-Section of Expected Equity Returns, Journal of Banking and Finance 35, 1213-1227.

Ferguson and Shockley (2003) show that omitting debt claims from the market portfolio proxy used in empirical stock pricing tests induces downward bias in a stock's market beta estimate, with the bias rising with the stock's leverage and distress risk. While the positive downward bias-leverage/distress risk relation appears promising to explain several well-known stock anomalies, we offer both theoretical and empirical evidence suggesting that the relation is likely negligible in the real world. In particular, our theory suggests the relation is diversified away in large economies, while our empirics reveal that economy-wide distress risk is simply too low for the omission of debt claims from the market portfolio proxy to generate a meaningful market beta bias.

  • Aretz, Kevin, Söhnke Bartram, and Peter Pope, 2010, Asymmetric Loss Functions and the Rationality of Expected Stock Returns, International Journal of Forecasting 27, 413-437.

We use the methodologies of Elliott, Komunjer, and Timmermann (2005) and Patton and Timmermann (2007) in combination with a block bootstrap to re-assess whether stock market return expectations retrieved from the Livingston Surveys are rational under asymmetric loss preferences (i.e., the differential weighting of positive and negative forecast errors). Assuming homogenous asymmetric loss preferences, our results align with the prior literature in strongly rejecting the hypothesis of rationality. However, allowing asymmetric loss preferences to vary across survey participants, we are no longer able to reject the same hypothesis.

  • Aretz, Kevin and Söhnke Bartram, 2011, Corporate Hedging: Lessons Learnt and Issues to be Explored, Journal of Financial Research 33, 317-371.

We present a comprehensive overview of the theoretical and empirical literature on corporate hedging. In our overview of the theory, we outline well-established positive rationales for how corporate hedging can contribute to shareholder value in the presence of market imperfections, such as financial distress costs, costs of external financing, asymmetric information, and taxes. In our overview of the empirical literature, we discuss the results from a broad set of empirical studies testing the positive rationales.

  • Aretz, Kevin, Söhnke Bartram, and Peter Pope, 2010, Macroeconomic Risks and Characteristic-Based Factor Models, Journal of Banking and Finance 33, 1383-1399.

We offer evidence that exposures to the Fama-French-Carhart benchmark factors SMB, HML, and WML price the cross-section of stock returns because the factors are timely and efficient proxies for macroeconomic risks, such as shocks to economic growth expectations, aggregate default risk, and the term-structure of interest rates. The factors reflect the macroeconomic risks since the long and short legs of the factors are differentially exposed to the macroeconomic risks. Setting up a linear factor model directly based on the macroeconomic risks, we show that this macroeconomic-risks model can compete with the Fama and French (1993) and Carhart (1997) models in pricing portfolios univariately or double-sorted on popular firm characteristics.

Please see my CV (available on the landing page) for several even older publications.