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Answer: Extremely adverse scenarios can be developed from moderately adverse periods in the past by multiplying movements in all risk factors by a certain amount, although this approach may fail to account for changes in correlations between these factors.
## Explanation **B is correct.** This statement accurately describes a common approach in stress testing where moderately adverse historical scenarios are made more extreme by scaling up risk factor movements. However, the statement correctly notes the limitation that this approach may fail to account for changes in correlations between risk factors, as correlations tend to increase during stressed economic conditions. **Why other options are incorrect:** - **A is incorrect:** Scenarios that haven't occurred in the past but are created by assuming changes in key variables ARE commonly used in stress testing. Stress tests are forward-looking by nature and often consider hypothetical scenarios that haven't been observed historically. - **C is incorrect:** Historical scenarios of one day or one week duration CAN be useful in stress testing. Examples include events like October 19, 1987 (Black Monday) or September 11, 2001. These short-horizon stress tests can supplement other risk measures like stressed VaR and stressed ES. - **D is incorrect:** Senior management SHOULD be involved in scenario development. They should challenge key assumptions and suggest new scenarios. Management involvement increases the credibility and practical application of stress testing results in decision-making processes. **Key Takeaway:** Stress testing scenarios can be developed through various approaches including historical scenarios, hypothetical scenarios, and scaled versions of historical events, but each approach has limitations that must be understood.
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The CRO of a multinational bank has assigned a team of risk analysts to design scenarios for an upcoming stress test. The analysts discuss the common approaches used by financial institutions to develop scenarios. Which of the following statements regarding stress testing scenarios is correct?
A
Scenarios that have not occurred in the past, but are created by assuming changes of a certain amount in key variables, are typically not used in stress testing.
B
Extremely adverse scenarios can be developed from moderately adverse periods in the past by multiplying movements in all risk factors by a certain amount, although this approach may fail to account for changes in correlations between these factors.
C
Historical scenarios of one day or one week in length are not useful in stress testing because such periods are not considered long enough to pose a meaningful threat to a bank's financial stability.
D
Senior management should leave the development of scenarios to risk managers and analysts who have the deepest knowledge of the risk exposures of the various business lines.