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Heterogeneity and Stability: Bolster the Strong, Not the Weak

Review of Financial Studies 2014 27(6), 1830-1867
We first study a stylized model of self-fulfilling panic among agents with differing fragilities to strategic risk and show that depending on the severity of coordination problems, the panic trigger threshold can depend only on one type's fragility. We then present a model of systemic panic among financial institutions with heterogeneous fragilities to financial spillovers. Concerns about potential spillovers generate strategic interaction, triggering a pre-emption game in which one tries to exit the market before others to avoid spillovers. Although financial contagion originates in weaker institutions, systemic risk can critically depend on financial health of stronger in the contagion chain. In this case, bolstering the strong, rather than the weak, more effectively enhances systemic stability.

Heterogeneity and Stability: Bolster the Strong, Not the Weak

Review of Financial Studies 2014 27(6), 1830-1867
We first study a stylized model of self-fulfilling panic among agents with differing fragilities to strategic risk and show that depending on the severity of coordination problems, the panic trigger threshold can depend only on one type's fragility. We then present a model of systemic panic among financial institutions with heterogeneous fragilities to financial spillovers. Concerns about potential spillovers generate strategic interaction, triggering a pre-emption game in which one tries to exit the market before others to avoid spillovers. Although financial contagion originates in weaker institutions, systemic risk can critically depend on financial health of stronger in the contagion chain. In this case, bolstering the strong, rather than the weak, more effectively enhances systemic stability.

CSR scores versus actual impacts: Banks’ main street lending during the great recession

Journal of Banking & Finance 2025 172, 107380
We examine the relationship between banks’ corporate social responsibility (CSR) scores, measured at the peak of the boom, and their lending behaviors during the Great Recession. High-CSR banks, expected to better support local borrowers during critical periods, instead reduced small business lending more sharply than their low-CSR counterparts. This paradox arises from CSR scores’ emphasis on visible but less material attributes, such as employee benefits, which are easier to measure during booms but deplete financial slack necessary for sustained lending under stress. Our findings highlight a misalignment between CSR metrics and material social impacts, underscoring the need for more reliable performance measures to implement stakeholderism effectively.

Debt–Equity Conflicts and Efficiency of Distressed Firms: Evidence from Japanese Banker-Directors

Journal of Financial and Quantitative Analysis 2026 61(3), 1283-1314 open access
This study provides direct evidence of the association between debt–equity conflict and investment efficiency in financially distressed firms. Leveraging a unique institutional setting in Japan, we examine the impact of lender-affiliated directors on the managerial decisions of their borrowers. Although banker-directors do not influence firms at low risks of default, their presence leads to more conservative financial decisions in distressed firms, thereby mitigating shareholder exploitation. They also reduce information frictions to prevent overinvestment and underinvestment. However, despite within-firm efficiency gains, potential spillover effects on other stakeholders raise questions about the broader welfare implications of this debt–equity conflict mitigation.

Watering a lemon tree: Heterogeneous risk taking and monetary policy transmission

Journal of Financial Intermediation 2021 47, 100873 open access
We build a general equilibrium model with financial frictions that impede monetary policy transmission. Agents with heterogeneous productivity can increase investment by levering up, which increases liquidity risk due to maturity transformation. In equilibrium, more productive agents choose higher leverage than less productive agents, which exposes the more productive agents to greater liquidity risk and makes their investment less responsive to interest rate changes. When monetary policy reduces interest rates, aggregate investment quality deteriorates, which blunts the monetary stimulus and decreases asset liquidation values. This, in turn, reduces loan demand, decreasing the interest rate further and generating a negative spiral. Overall, the allocation of credit is distorted and monetary stimulus can become ineffective even with significant interest rate drops.

Does Securitization Weaken Screening Incentives?

Journal of Financial and Quantitative Analysis 2021 56(8), 2934-2962
We test whether lenders’ screening incentives weaken when faced with the possibility of loan sales. We adopt a new measure of lending standards, the processing time for mortgage applications at the loan level, and use the collapse of the nonagency mortgage-backed securities issuance market as a natural experiment. Secondary market liquidity for nonconforming loans decreased significantly at the end of 2007, but the market for securitizing conforming loans did not experience the same breakdown. Following this event, lenders spent significantly more time screening applications for loans larger than the conforming loan limits than for those below the limits. The processing-time gap widened more for banks with lower capital, greater involvement in the originate-to-distribute model, and larger assets.

A Theory of Collateral for the Lender of Last Resort

Review of Finance 2021 25(4), 973-996
We consider a macroprudential approach to analyze the optimal lending policy for the central bank, focusing on spillover effects that policy exerts on money markets. Lending against high-quality collateral protects central banks against losses, but can adversely affect liquidity creation in markets since high-quality collateral gets locked up with the central bank rather than circulating in markets. Lending against low-quality collateral creates counterparty risk but can improve liquidity in markets. We illustrate the optimal policy incorporating these trade-offs. Contrary to what is generally accepted, lending against high-quality collateral can have negative effects, whereas it may be optimal to lend against low-quality collateral.

Sooner or Later: Timing of Monetary Policy with Heterogeneous Risk-Taking

American Economic Review 2016 106(5), 490-495
We analyze the effects and interactions of monetary policy tools that differ in terms of their timing and their targeting. In a model with heterogeneous agents, more productive agents endogenously expose themselves to higher interim liquidity risk by borrowing and investing more. Two inefficiencies impair the transmission of monetary policy: an investment- and a hoarding inefficiency. Heterogeneous agents respond disparately to ex-ante, conventional and ex-post, unconventional monetary policy. However, we show that the two policies are equivalent due to the endogeneity of hoarding. In contrast, targeted interventions such as discount-window lending can alleviate both inefficiencies at the same time.