On a capital allocation principle coherent with the Solvency 2 standard formula
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Solvency II Directive 2009/138/EC requires an insurance and reinsurance undertakings assessment of a Solvency Capital Requirement by means of the so-called "Standard Formula" or by means of partial or full internal models. Focusing on the first approach, the bottom-up aggregation formula proposed by the regulator permits a capital reduction due to diversification effect, according to the typical subadditivity property of risk measures. However, once the overall capital has been assessed no specific allocation formula is provided or required in order to evaluate the contribution of each risk source on the overall SCR. The aim of this paper is to provide a closed formula for capital allocation fully coherent with the Solvency II Capital Requirement assessed by means of Standard Formula. The solution proposed permits a top-down approach to assess the allocated SCR among the risks considered in the multilevel aggregation scheme established by Solvency II. Besides, we demonstrate that the allocation formula here proposed is consistent with the Euler's allocation principle
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