In joint ventures on shirkah and mudārabah, the knowledge of profit / loss sharing ratio is imperative at the inception of the contract. Although there appears to be some difference on whether it is necessary to stipulate these aspects in the agreement, a perusal of accepted works of the schools would reveal that where this is not required, it is due to the fact that certain schools do not recognize the possibility of any variation occurring pertaining to these. Thus, the Shāfi‛i school holds that profit (as well as loss) in shirkah would necessarily be owned by the partners in proportion to their respective capitals, irrespective of whether this fact is stipulated in the agreement or not. If any condition is agreed to the contrary, the contract becomes invalid. The position of the Māliki school in this respect is similar, who also state that labor, too, would be contributed by the parties in proportion to their capital investment, even when these aspects are not stipulat