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The Industrial Organization of the US Residential Mortgage Market

The Industrial Organization of the US Residential Mortgage Market We show that the US residential single-family mortgage-origination market is highly concentrated once account is taken of the contractual coordination that arises from the correspondent- and warehouse-funding channels. We represent these channels as a network, using the flow of loans through three strata of the loan origination market: origination, aggregation, and securitization. We develop a network representation of the origination market and demonstrate that it is a small world, in that most nodes are close in the network. We then rank-order the interlinked aggregators and securitizers using ex post mortgage foreclosure rates as a proxy for performance. Our findings suggest that these significant interlinkages in the mortgage-origination network represent a previously underappreciated source of systemic risk. Many apparently atomistic mortgage underwriters are, in fact, coordinated to act in parallel because of their funding relationships with the large, too-big-to-fail bank holding companies. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Annual Review of Financial Economics Annual Reviews

The Industrial Organization of the US Residential Mortgage Market

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Publisher
Annual Reviews
Copyright
Copyright © 2014 by Annual Reviews. All rights reserved
ISSN
1941-1367
eISSN
1941-1375
DOI
10.1146/annurev-financial-110613-034324
Publisher site
See Article on Publisher Site

Abstract

We show that the US residential single-family mortgage-origination market is highly concentrated once account is taken of the contractual coordination that arises from the correspondent- and warehouse-funding channels. We represent these channels as a network, using the flow of loans through three strata of the loan origination market: origination, aggregation, and securitization. We develop a network representation of the origination market and demonstrate that it is a small world, in that most nodes are close in the network. We then rank-order the interlinked aggregators and securitizers using ex post mortgage foreclosure rates as a proxy for performance. Our findings suggest that these significant interlinkages in the mortgage-origination network represent a previously underappreciated source of systemic risk. Many apparently atomistic mortgage underwriters are, in fact, coordinated to act in parallel because of their funding relationships with the large, too-big-to-fail bank holding companies.

Journal

Annual Review of Financial EconomicsAnnual Reviews

Published: Dec 1, 2014

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