It is declared to be the policy and intent of the legislature that the total appropriations made by it, or the total of any budget approved by it, for any department or establishment, shall be deemed to be the maximum amount authorized to meet the requirements of the department or establishment for the period of the appropriation, excepting as may otherwise be provided by law, and that the governor and the director of finance should be given the powers granted by sections 37-32 to 37-41 in order that savings may be effected by careful supervision throughout each appropriation period with due regard to changing conditions; and by promoting more economic and efficient management of state departments and establishments.