Explanation:
The Asymptotic Risk Factor (ASFR) model, integral to the A-IRB approach under Basel II, operates on the principle of complete diversification within a bank's credit portfolio. This model posits that idiosyncratic risks associated with individual exposures tend to cancel each other out, leaving only systematic risk as a material factor influencing portfolio losses. The assumption of complete diversification is crucial in the ASFR model as it allows for a more accurate and holistic assessment of the credit portfolio's overall risk.
A is incorrect because the ASFR model does not assume that idiosyncratic risks are predominant; instead, it focuses on systematic risk after considering the cancellation effect of diversified idiosyncratic risks.
B is incorrect because the ASFR model does not require an undiversified credit portfolio. In fact, it assumes that the portfolio is completely diversified.
D is incorrect because the ASFR model does not consider individual credit exposures in isolation; rather, it emphasizes the overall risk profile after accounting for diversification and systematic risk.
Things to Remember
Understanding the principle of portfolio diversification in the ASFR model is key for banks adopting the A-IRB approach, as it influences the calculation of Risk-Weighted Assets (RWA).
This model underscores the importance of systematic risk in the overall risk assessment of a bank’s credit portfolio under the A-IRB approach.
The ASFR model's assumption of complete diversification aids in simplifying the complex task of RWA calculation by focusing on systemic rather than idiosyncratic risks.
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Q.5969 A large banking group is implementing the Advanced Internal Ratings-Based (A-IRB) approach under Basel II for its global operations. The risk management team is focusing on the Asymptotic Risk Factor (ASFR) model, a key component in determining the Risk-Weighted Assets (RWA). Which of the following statements accurately reflects the principles of the ASFR model in the context of the A-IRB approach?
A
The ASFR model assumes that idiosyncratic risks are predominant over systematic risks in the credit portfolio.
B
The model requires banks to maintain a completely undiversified credit portfolio for accurate RWA calculation.
C
The ASFR model assumes complete diversification of the credit portfolio, meaning idiosyncratic risks cancel each other out.
D
In the ASFR model, individual credit exposures are considered independently without regard to their correlation with the broader market.