(2) During any period of emergency the powers exercisable in relation to a design by a Government department or a person authorised by the Minister under section eighteen, shall include power to use the design for any purpose which appears to the Minister necessary or expedient(a) for the efficient prosecution of any war in which the Republic may be engaged; (b) for the maintenance of supplies and services essential to the life of the community; (c) for securing a sufficiency of supplies and services essential to the well-being of the community; (d) for promoting the productivity of industry, commerce and agriculture; (e) for fostering and directing exports and reducing imports or imports of any classes, from all or any countries and for redressing the balance of trade; (f) generally for ensuring that the whole resources of the community are available for use, and are used, in a manner best calculated to serve the interests of the community; or (g) for assisting the relief of suffering and the restoration and distribution of essential supplies and services in Zambia or any foreign countries that are in grave distress as the result of war; and any reference in this Part to the services of the State shall be construed as including a reference to the purposes aforesaid. (As amended by G.N. No. 187 of 1964 and S.I. No. 175 of 1965) 21. (1) Any dispute as to- (a) the exercise by a Government department or a person authorised by the Minister of the powers conferred by section eighteen; Reference of disputes as to State use