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Keywords:Basel Accord 

Working Paper
ENDOGENOUS/EXOGENOUS SEGMENTATION IN THE A-IRB FRAMEWORK AND THE PRO-CYCLICALITY OF CAPITAL: AN APPLICATION TO MORTGAGE PORTFOLIOS

This paper investigates the pro-cyclicality of capital in the advanced internal ratings-based (A-IRB) Basel approach for retail portfolios and identifies the fundamental assumptions required for stable A-IRB risk weights over the economic cycle. Specifically, it distinguishes between endogenous and exogenous segmentation risk drivers and, through application to a portfolio of first mortgages, shows that risk weights remain stable over the economic cycle when the segmentation scheme is derived using exogenous risk drivers, while segmentation schemes that include endogenous risk drivers are ...
Working Papers , Paper 17-9

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