Related provisions for BIPRU 7.9.27
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The values assigned to inputs into a firm's model should be derived either stochastically, by assuming the value of an item can follow an appropriate probability distribution and by selecting appropriate values at the tail of the distribution, or deterministically, using appropriate prudent assumptions. For options or guarantees which change in value significantly in certain economic or demographic circumstances, a stochastic approach would normally be appropriate.
In identifying scenarios, and assessing their impact, a firm should take into account, where material, how changes in circumstances might impact upon:(1) the nature, scale and mix of its future activities; and(2) the behaviour of counterparties, and of the firm itself, including the exercise of choices (for example, options embedded in financial instruments or contracts of insurance).