Informed and Uninformed Investment in Housing: The Downside of Diversification
研究发现，集中在少数市场的抵押贷款机构比分散的机构更注重信息收集，能更好定价风险、减少信贷配给，但逆向选择导致其保留更多抵押贷款，且利润更高、波动更小，在2007-2008危机中股价跌幅更小。
Mortgage lenders that concentrate in a few markets invest more in information collection than diversified lenders. Concentrated lenders focus on the information-intensive jumbo market and on high-risk borrowers. They are better positioned to price risks and, thus, ration credit less. Adverse selection, however, leads to higher retention of mortgages relative to diversified lenders. Finally, concentrated lenders have higher profits than diversified lenders, their profits vary less systematically, and their stock prices fell less during the 2007--2008 credit crisis. The results imply that geographic diversification led to a decline in screening by lenders, which likely played a role in the 2007--2008 crisis. The Author 2011. Published by Oxford University Press on behalf of The Society for Financial Studies. All rights reserved. For Permissions, please e-mail: journals.permissions@oup.com., Oxford University Press.