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A limitation of value at risk (VAR) is that it is difficult to estimate due to the uncertainty of tail exposure for differing economic structures. Regarding tail events, they happen: A. infrequently and are therefore difficult to associate with accurate probabilities. B. infrequently and are therefore easy to associate with accurate probabilities. C. frequently and are therefore difficult to associate with accurate probabilities. D. frequently and are therefore easy to associate with accurate probabilities. |