The requirement that the Permanent Head (and on review, the Minister) shall have regard to the costs necessarily incurred, tends in itself to show that his duty in respect of those costs is limited to having regard to them. He must take them into account and consider them and give due weight to them, but he has an ultimate discretion. He is not bound to increase the scale of fees on a basis which incorporates the whole or any part of the increased costs [2] but, of course, he may do so if in his opinion it is proper to fix such a scale for the nursing home. If the applicant or other proprietor arranges to rent premises, hire equipment or contract for services for accommodation or nursing, the Minister is not required to rubber-stamp these costs, by adding all such costs then a profit margin on top, and determine a scale of fees accordingly, as the applicant contended. On fixing a scale of fees for the home, the Minister is not restricted to having regard to costs necessarily incurred, but may have regard to other facts and circumstances. The purpose of providing a government subsidy is to lower costs to the public. This legislative purpose might be defeated if the Minister were to fix scales of fees by automatically including any costs necessarily incurred, even if this resulted in unreasonably high scales. It was suggested during argument that if the fees are high, persons seeking nursing care are free to go elsewhere. In truth, however, there is not a free market because there is a quasi-monopoly in that the existence of approved nursing homes in a locality may ground a refusal of an application for approval of another nursing home (see s. 40AA(3)). The Minister may adopt a general policy in regard to scales of fees, and deal with a review of fees for a nursing home in the light of that policy, but his determination or review must be in order to arrive at an appropriate scale of fees for the particular nursing home. If the costs necessarily incurred are excessive for any reason whether inside or outside the control of the proprietor, it may be that the scale of fees the Minister determines is such that if those costs continue, the home can be conducted only at little profit or at a loss. If that result follows it is because the Minister is not engaged in determining a scale of fees according to a cost plus system; he is carrying out a statutory duty to determine what, in his opinion, is an appropriate scale of fees in relation to the approved nursing home.