Irrespective of the above-mentioned limitations of the cost function they still benefit the managers in a couple of ways. The biggest problem faced by the manager economist is choose the best possible type of equation of curve that best describes the cost data of the firm. It is with the help of the cost functions that the managers may know the exact fixed expenses that need to be incurred irrespective of the amount of output. And then may plan his strategies accordingly to maximize his output ratio from the input combination in use. This further helps the manager in determining the cost-output relationship, as the total cost increases with the increase in output and vice-versa.
In other words, it can also be said that the manager is made available with the cost function relating with the plant size; which is a very important variable of cost. In the end, it may also be added that with the help of cost function managers are able to increase their managerial efficiency as more the Managerial efficiency less the cost of production. And many managers strive to achieve the same.