Tail risk events are challenging to model or predict ahead of time. Scenario analysis can provide an indication of how a portfolio would perform under certain conditions, such as spreads widening by a certain amount across the credit curve. The positions in a portfolio can be stressed in scenario analysis assuming similar outcomes of a past crisis recur.
这句话答案是正确的，但我的理解是他tail risk有一部部分是极端损失的风险，这里说scenario analysis assuming similar outcomes of a past crisis recur，past可能并没有发生过这种极端风险，所以怎么能assume这种情况呢？
