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Answer: Assign different credit risk weights for residential mortgages based on each mortgage's loan-to-value ratio.
## Explanation **B is correct.** One of the key changes in the December 2017 Basel reforms was the introduction of a set of variable risk weights for residential mortgages which varied based on the risk of the mortgage. This risk is reflected mainly in the loan-to-value (LTV) ratio with higher LTV mortgages receiving higher risk weights. This replaces an old flat rate system. **A is incorrect.** The Basel reforms replaced the advanced measurement approach for operational risk, which required the use of internal models, with a standardized approach to be used by all banks. The new standardized approach does not allow internal modeling. **C is incorrect.** The new reforms eliminated the use of the IRB approach for these asset classes. **D is incorrect.** The 2017 reforms introduced a leverage ratio buffer that requires G-SIBs to have a higher minimum Tier 1 leverage ratio. Therefore, if anything, the target Tier 1 leverage ratio should increase. Also, the countercyclical buffer requirements were not changed as part of this reform. ### Key Learning Points: - The December 2017 Basel III revisions introduced risk-sensitive capital requirements for residential mortgages based on LTV ratios - Operational risk capital calculation moved from internal models to standardized approaches - IRB approaches were eliminated for certain asset classes including exposures to banks and large corporations - G-SIBs face higher leverage ratio requirements, not lower ones
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The CRO of a large bank has asked a group of risk managers to prepare a plan to implement the revisions to the Basel III guidelines finalized in December 2017. The bank expects to qualify as a global systemically important bank (G-SIB) by the time the revisions are implemented. Which of the following actions is most appropriate for the bank to take to comply with the revised Basel III guidelines?
A
Introduce an internally created model to determine the bank's operational risk capital.
B
Assign different credit risk weights for residential mortgages based on each mortgage's loan-to-value ratio.
C
Apply the advanced internal rating-based approach for certain types of credit exposures, such as exposures to banks and large corporations.
D
Decrease the bank's target level of its countercyclical buffer and its Basel III Tier 1 leverage ratio.