Ariel Zetlin-Jones

Adverse Selection, Reputation and Sudden Collapses in Secondary Loan Markets

Banks and financial intermediaries that originate loans often sell some of these loans or securitize them in secondary loan markets and hold on to others. New issuances in such secondary markets collapse abruptly on occasion, typically when collateral values used to secure the underlying loans fall. These collapses are viewed by policymakers as signs that the market is not functioning efficiently. In this paper, we develop a dynamic adverse selection model in which small reductions in collateral values can generate abrupt inefficient collapses in new issuances in the secondary loan market. In our model, reductions in collateral values worsen the adverse selection problem and induce some potential sellers to hold on to their loans. Reputational incentives induce a large fraction of potential sellers to hold on to their loans rather than sell them in the secondary market. We find that a variety of policies that have been proposed during the recent crisis to remedy market inefficiencies do not help resolve the adverse selection problem.

Screening and Adverse Selection in Frictional Markets

We incorporate a search-theoretic model of imperfect competition into a standard model of asymmetric information with unrestricted contracts. We characterize the unique equilibrium and use our characterization to explore the interaction between adverse selection, screening, and imperfect competition. We show that the relationship between an agent’s type, the quantity he trades, and the price he pays is jointly determined by the severity of adverse selection and the concentration of market power. Therefore, quantifying the effects of adverse selection requires controlling for market structure. We also show that increasing competition and reducing informational asymmetries can decrease welfare.

Market-making with Search and Information Frictions

We develop a dynamic model of trading through market-makers that incorporates two canonical sources of illiquidity: trading (or search) frictions, which imply that market-makers have some amount of market power; and information frictions, which imply that market-makers face some degree of adverse selection. We use this model to study the effects of various technological innovations and regulatory initiatives that have reduced trading frictions in over-the-counter markets. Our main result is that reducing trading frictions can lead to less liquidity, as measured by bid-ask spreads. The key insight is that more frequent trading�?or more competition among dealers�?makes traders’ behavior less dependent on asset quality. As a result, dealers learn about asset quality more slowly and set wider bid-ask spreads to compensate for this increase in uncertainty.

Bailouts, Moral Hazard and Bankss Home Bias for Sovereign Debt

This paper shows that an increase in banks’ holdings of domestic sovereign debt decreases the ability of domestic sovereigns to successfully enact bailouts. When sovereigns finance bailouts with newly issued debt and the price of sovereign debt is sensitive to unanticipated debt issues, then bailouts dilute the value of banks’ sovereign debt holdings rendering bailouts less effective. We explore this feedback mechanism in a model of financial intermediation in which banks are subject to managerial moral hazard and ex ante optimality requires lenders to commit to ex post inefficient bank liquidations. A benevolent sovereign may desire to enact bailouts to prevent such liquidations thereby neutralizing lenders’ commitment. In this context, home bias for sovereign debt may arise as a mechanism to deter bailouts and restore lenders’ commitment.