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Closing the pension scheme to new entrants would not save the company money in the short term, but it would reduce actuarial risk.
Making sure that the assumptions in a model actually reflect real life is absolutely vital for the pricing of all types of insurance. Flaws in a model's assumptions could lead to premium mispricing. In the worst case scenario, an actuary may underestimate the frequency of an event. The unaccounted incidents will cause an increase in the frequency of payouts, which could bankrupt an insurer.