§ 651. Investments. Every licensee shall at all times maintain permissible investments having (i) a market value, computed in accordance with generally accepted accounting principles, at least equal to the aggregate of the amount of all its outstanding payment instruments and all its outstanding traveler's checks or (ii) a net carrying value, computed in accordance with generally accepted accounting principles, at least equal to the aggregate of the amount of all its outstanding payment instruments and all its outstanding traveler's checks so long as the market value of such permissible investments is at least eighty per centum of the net carrying value. Notwithstanding the foregoing provisions of this section, the superintendent shall have the authority, for good cause shown, to exempt from the requirements of this section any licensee.