Related provisions for BIPRU 7.10.132
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In aggregating VaR measures across risk or product categories, a firm must not use the square root of the sum of the squares approach unless the assumption of zero correlation between these categories is empirically justified. If correlations between risk categories are not empirically justified, the VaR measures for each category must simply be added in order to determine its aggregate VaR measure. But to the extent that a firm'sVaR model permission provides for a different way
(1) This paragraph contains guidance on the inclusion of CIUs in a VaR model.(2) The appropriate regulator may allow all types of CIU to be included within the scope of a firm'sVaR model permission.(3) BIPRU 7.10 does not distinguish between specific risk and general market risk for positions in CIUs. Therefore even if specific risk is not otherwise included within the scope of a firm'sVaR model permission, a firm should be able to demonstrate that its VaR model captures specific
By modifying GENPRU 2.1.52 R (Calculation of the market risk capital requirement) to allow the firm to use the VaR model to calculate all or part of its PRR for certain positions, the appropriate regulator is treating it like an application rule. The modification means that the PRR calculation set out in BIPRU 7.10 supersedes the standard market risk PRR rules for products and risks coming within the scope of the VaR model permission.