Modeling Your Stress Away
Friederike Niepmann and
No 1232, International Finance Discussion Papers from Board of Governors of the Federal Reserve System (U.S.)
We investigate systematic changes in banks' projected credit losses between the 2014 and 2016 EBA stress tests, employing methodology from Philippon et al. (2017). We find that projected credit losses were smoothed across the tests through systematic model adjustments. Those banks whose losses would have increased the most from 2014 to 2016 due to changes in the supervisory scenarios-keeping the models constant and controlling for changes in the riskiness of underlying portfolios-saw the largest decrease in losses due to model changes. Model changes were more pronounced for banks that rely more on the Internal Ratings-Based approach, and they explain the cross-section of market responses to the release of the 2016 results. Stock prices and CDS spreads increased more for banks with larger reductions in projected credit losses due to model changes, as investors apparently did not interpret lower loan losses as reflecting mainly a decrease in credit risk but, instead, as a sign of lower capital requirements going forward.
Keywords: Stress tests; Financial institutions; Regulation; Credit risk models (search for similar items in EconPapers)
JEL-codes: G21 G28 (search for similar items in EconPapers)
New Economics Papers: this item is included in nep-cba and nep-rmg
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Working Paper: Modeling Your Stress Away (2018)
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