99.9% - really?

Ilkka Kiema and Esa Jokivuolle

No 25/2013, Bank of Finland Research Discussion Papers from Bank of Finland

Abstract: The aim of the Internal Ratings Based Approach (IRBA) of Basel II was that capital suffices for unexpected losses with at least a 99.9% probability. However, because only a fraction of the required regulatory capital (a quarter to a half) had to be loss absorbing capital, the actual bank solvency probabilities may have been much lower, as the global financial crisis illustrates. Our estimates suggest that under Basel II IRBA the loss-absorbing capital of an average-quality portfolio bank suffices for unexpected losses with a 95%-99% probability. This translates into an expected bank failure rate as high as once in twenty years. Even if the bank s interest income is incorporated into our model, the expected failure rate is still substantial. We show that the expected failure rate increases with loan portfolio riskiness. Our calculations may be viewed as a measure of regulatory "self-delusion" included in Basel II capital requirements.

Keywords: capital requirements; Internal Ratings Based Approach; Basel II; financial crisis (search for similar items in EconPapers)
Date: 2013
References: View references in EconPapers View complete reference list from CitEc
Citations:

Downloads: (external link)
https://www.econstor.eu/bitstream/10419/212265/1/bof-rdp2013-025.pdf (application/pdf)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:zbw:bofrdp:rdp2013_025

Access Statistics for this paper

More papers in Bank of Finland Research Discussion Papers from Bank of Finland Contact information at EDIRC.
Bibliographic data for series maintained by ZBW - Leibniz Information Centre for Economics ().