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Debt Renegotiation and Debt Overhang: Evidence from Lender Mergers

Journal of Financial and Quantitative Analysis 2021 56(3), 995-1021 open access
This article studies whether debt renegotiation mitigates debt overhang and increases corporate investment. Using mergers between lenders participating in the same syndicated loans as natural experiments that reduce the number of lenders and thus make renegotiation easier, I find that the firms affected by the mergers become more likely to renegotiate the loans and increase capital investment. The effect is stronger for firms with higher Q and firms in financial distress, supporting the hypothesis that the lender mergers mitigate the debt-overhang problem.

Recovering copulas from limited information and an application to asset allocation

Journal of Banking & Finance 2011 35(7), 1824-1842 open access
This paper proposes an entropy-based method to construct a new class of copulas – the most entropic canonical copulas (MECC). Our empirical study focuses on an investment problem for an investor with a constant relative risk aversion (CRRA) utility function allocating wealth between the Dow Jones Large-Cap and Small-Cap indices, of which the contemporaneous dependence can be modeled by the MECC or other commonly-used copulas. Both the theoretical analysis of the method and the empirical study indicate the potential for enormous statistical and economic gains as a result of using the MECC.

Production Functions with Factor-Oriented Scale Sensitivity

The Review of Economics and Statistics 1996 78(2), 309 open access
The analysis of economic phenomena at the wholistic (aggregative) level 11l8intains a long tradition that assumes the neoclassical production function Q-f(K,L) (i.e., output as a function of capital and labor) satisfies the condition of constant returns to scale.The assumed absence of any (dis-)economies of scale renders the production function useless, when the scale effect is as pronounced as is typically found at the less aggregative levels of individual firm or industry analvsis.. .The purpose of this paper is to deduce new classes of production functions that are not limited to the constant returns to scale characteristic.Hore specifically, the scale effect is described by an arbitrary function of one of the factors of production, capital in this paper.This class of production functions exhibi-ts scale sensitivity with respect to capital (SSWK).The paper shows how different fmidlies of production functions can be derived from two basic .. building blocks," a :wage share function and a scale functitm.The Cobb-])ouglas, CES and VES production fmu:tions are special cases.~e Cobb-Douglas and CES functions can be expanded to incorporate non-constant returns to scale.A smnple of firms from Taiwan is used to test among various derived functional specifications.An interesting diversity of preferred specifications was found among three industries.

The Industry Expertise Channel in Mortgage Lending

Journal of Financial and Quantitative Analysis 2026 61(2), 738-767 open access
We show that banks use industry knowledge acquired through corporate lending in mortgage lending, a phenomenon we refer to as the “industry expertise channel.” Specifically, banks that specialize in particular industries expand their mortgage lending activity in regions where those industries are concentrated. The impact of industry expertise increases with information asymmetry and borrower risk. In addition, mortgages originated from this channel contain more soft information and perform better. The effect of the channel increases after unexpected industry distress and the 2008 financial crisis, suggesting that the effect is likely causal.

Competition and Strategic Incentives in the Market for Credit Ratings: Empirics of the Financial Crisis of 2007

American Economic Review 2019 109(10), 3514-3555 open access
We study the market for ratings agencies in the commercial mortgage backed securities sector leading up to and including the financial crisis of 2007–2008. Using a structural model adapted from the auctions literature, we characterize the incentives of ratings agencies to distort ratings in favor of issuers. We find an important equilibrium distortion, which decreased after the crisis. We study several counterfactual experiments motivated by recent policymaking in this industry.

Do Academically Struggling Students Benefit from Continued Student Loan Access? Evidence from University and Beyond

The Review of Economics and Statistics 2024 106(1), 68-84 open access
We estimate the effects of student loan access on educational attainment and labor market returns in New Zealand. We exploit the introduction of a national policy mandating a 50% pass rate for student loan renewals using a regression discontinuity design. Retaining loan access increases reenrollment for students around the threshold, and a majority eventually graduate with a bachelor's degree within seven years. We find that retaining student loan access leads to large labor market returns for struggling students. The additional debt from further borrowing is small relative to the earnings returns and declines quickly due to faster repayment.

Counterparty credit risk and derivatives pricing

Journal of Financial Economics 2019 134(3), 647-668 open access
We derive a model with qualitative implications for options pricing under counterparty credit risk and provide empirical evidence using the data from the Hong Kong derivatives market during 2005–2014. We find that the log-price difference between a derivative warrant with counterparty credit risk and an otherwise identical option without counterparty credit risk is significantly and negatively associated with the credit default swap spread on the warrant issuer. We also find that the prices of out-of-the-money put warrants are more sensitive to credit risk than those of other warrants. Our results show counterparty credit risk matters for derivative pricing.

Diagnosing affine models of options pricing: Evidence from VIX

Journal of Financial Economics 2013 107(1), 199-219 open access
Affine jump-diffusion models have been the mainstream in options pricing because of their analytical tractability. Popular affine jump-diffusion models, however, are still unsatisfactory in describing the options data and the problem is often attributed to the diffusion term of the unobserved state variables. Using prices of variance-swaps (i.e., squared VIX) implied from options prices, we provide fresh evidence regarding the misspecification of affine jump-diffusion models, as variance-swap prices are affine functions of the state variables in a broader class of models that do not restrict the diffusion term of the state variables. We apply the nonparametric methodology used by Aït-Sahalia (1996b), supplemented with bootstrap tests and other parametric tests, to the S&P 500 index options data from January 1996 to September 2008. We find that, while the affine diffusion term of the state variables may contribute to the misspecification as the literature has suggested, the affine drift of the state variables, jump intensities, and risk premiums are also sources of misspecification.

Shareholder-Creditor Conflict and the Resolution of Financial Distress

The Review of Corporate Finance Studies 2025 14(3), 804-838 open access
Constructing a comprehensive data set of financially distressed firms that restructured their debts from 2000–2014, we find that firms with financial institutions’ loan-equity simultaneous holdings are more likely to restructure out of court than to file for bankruptcy. The effect is stronger when loans are oversecured and when the expected bankruptcy costs are larger. We use mergers of financial institutions and instrumental variable estimations to address potential endogeneity concerns. Firms with simultaneous holdings experience higher stock returns. The evidence suggests that mitigating shareholder-creditor conflict results in cost-effective resolutions of financial distress.