Leonard N. Stern School of Business
New York University
44 West 4th Street, Room 7-64
New York, NY 10012
NBER Working Papers and Publications
|February 2010||Optimal Interventions in Markets with Adverse Selection|
with Thomas Philippon: w15785
We characterize cost-minimizing interventions to restore lending and investment when markets fail due to adverse selection. We solve a mechanism design problem where the strategic decision to participate in a government's program signals information that affects the financing terms of non-participating borrowers. In this environment, we find that the government cannot selectively attract good borrowers, that the efficiency of an intervention is fully determined by the market rate for non-participating borrowers, and that simple programs of debt guarantee are optimal, while equity injections or asset purchases are not. Finally, the government does not benefit from shutting down private markets.
Published: Thomas Philippon & Vasiliki Skreta, 2012. "Optimal Interventions in Markets with Adverse Selection," American Economic Review, American Economic Association, vol. 102(1), pages 1-28, February. citation courtesy of
|February 2009||Ratings Shopping and Asset Complexity: A Theory of Ratings Inflation|
with Laura Veldkamp: w14761
Many identify inflated credit ratings as one contributor to the recent financial market turmoil. We develop an equilibrium model of the market for ratings and use it to examine possible origins of and cures for ratings inflation. In the model, asset issuers can shop for ratings -- observe multiple ratings and disclose only the most favorable -- before auctioning their assets. When assets are simple, agencies' ratings are similar and the incentive to ratings shop is low. When assets are sufficiently complex, ratings differ enough that an incentive to shop emerges. Thus, an increase in the complexity of recently-issued securities could create a systematic bias in disclosed ratings, despite the fact that each ratings agency produces an unbiased estimate of the asset's true quality. Increasing...
Published: Skreta, Vasiliki & Veldkamp, Laura, 2009.
"Ratings shopping and asset complexity: A theory of ratings inflation,"
Journal of Monetary Economics,
Elsevier, vol. 56(5), pages 678-695, July.
citation courtesy of