The transition to a global formulary apportionment system therefore would present enormous political and administrative complexity and require a level of international cooperation that is unrealistic to expect in the field of international taxation. Such multilateral coordination would require the inclusion of all major countries where MNEs operate. If all the major countries failed to agree to move to global formulary apportionment, MNEs would be faced with the burden of complying with two totally different systems. In other words, for the same set of transactions they would be forced to calculate the profits accruing to their members under two completely different standards. Such a result would create the potential for double taxation (or under-taxation) in every case.