The relative value of each controlled taxpayer’s contribution to the success of the relevant business activity must be determined in a manner that reflects the functions performed, risks assumed, and resources employed by each participant in the relevant business activity, consistent with the comparability provisions of § 1.482-1(d)(3). Such an allocation is intended to correspond to the division of profit or loss that would result from an arrangement between uncontrolled taxpayers, each performing functions similar to those of the various controlled taxpayers engaged in the relevant business activity. The profit allocated to any particular member of a controlled group is not necessarily limited to the total operating profit of the group from the relevant business activity. For example, in a given year, one member of the group may earn a profit while another member incurs a loss. In addition, it may not be assumed that the combined operating profit or loss from the relevant business activity should be shared equally, or in any other arbitrary proportion. The specific method of allocation must be determined under paragraph (c) of this section ...