Final answer:
The 'corridor' concept is linked to Universal life insurance policies. It refers to the necessary gap between the policy's cash value and death benefit to maintain tax advantages.
Step-by-step explanation:
The concept of "corridor" is most closely associated with Universal life insurance policies. The corridor refers to the gap between the cash value and the death benefit in a universal life insurance policy. This is necessary to maintain the policy's status as a life insurance contract for tax purposes. If the cash value comes too close to the death benefit, the excess may be subject to taxation. Therefore, a certain corridor or gap must be maintained to secure the tax advantages of the life insurance policy.