Explanation:
In Vasicek's model, which is used in the Basel II Internal Ratings-Based (IRB) approach, the confidence level (X) plays a crucial role in determining the capital requirements for credit risk. The confidence level specifies the percentile of the loss distribution that the bank must be prepared to cover with its capital to remain solvent during extreme conditions. Specifically, it determines the worst-case default rate (WCDR) that the bank must be able to withstand.
A is incorrect. The confidence level does not set the threshold for expected loss but for unexpected loss. Expected loss is covered by provisions, not capital.
C is incorrect. The confidence level does not represent a capital percentage but defines the point on the default distribution that must be covered.
(Note: Option D is also incorrect as the confidence level is concerned with extreme loss scenarios for solvency, not dictating diversification targets).
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Q.6040 A risk manager at a global bank is explaining to the board how Vasicek's model is utilized to estimate capital requirements under the Basel II IRB approach. The manager provides an example with a probability of default (PD) of 2%, credit correlation (ρ) of 12%, and a confidence level (X) of 99.9%. What role does the confidence level (X) play in determining the capital requirement using Vasicek's model?
A
It sets the threshold for the expected loss that must be covered by the capital allocation.
B
It determines the worst-case default rate (WCDR) that the bank needs to be able to withstand.
C
It indicates the minimum percentage of capital that must be held against potential future losses.
D
It dictates the level of diversification the bank must achieve within its loan portfolio.
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