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Abstract
Using the universe of mortgage applications data and detailed credit performance data, we document that since the early 1990s there was a significant decline in the share of mortgages with co-borrowers. Although the decline was an almost universal phenomenon across different regions of the US, the rate of the decline showed significant spatial heterogeneity and in turn had implications for regional differences in economic activity. We show that the presence of a co-borrower reduces the mortgage default probability by more than 50 percent for both prime and subprime loans and those regions that had a lower co-borrower share prior to the crisis experienced higher mortgage default rates over the period 2007-2010. Higher default rates created spillovers on economic activity during the Great Recession: a lower co-borrower share at the regional level was also related to persistently lower house price growth, refinancing growth and mortgage credit growth. These results imply that the decrease in the share of mortgages with co-borrowers made the US mortgage market more vulnerable to the financial crisis and contributed to the divergence in economic outcomes across different regions.
JEL Codes: G21, G51, R21.
The views expressed are those of the author(s) and do not necessarily represent those of the Bank of Lithuania.
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Working Paper Series

Working papers disseminate economic research relevant not only to the tasks and functions of the Bank of Lithuania and of the European System of Central Banks but also appealing more broadly to the academic community in economics and finance. They present, discuss and analyse the results of original and academically rigorous theoretical and/or empirical research. Working papers constitute the basis for publications in leading academic journals, making contributions to the existing literature in the fields of economics and finance. They encourage collaboration between the researchers of the Bank of Lithuania and other central banks, Lithuanian and foreign universities and research institutes.
Papers are only available in English.
No 78
2020-08-21
Bowling Alone, Buying Alone: The Decline of Co-Borrowers in the US Mortgage Market
No 69
2019-12-13
No 16
2014-11-11