In considering this question it is to be borne in mind that here and in England it has long been a practice in coal mining leases to reserve both a fixed minimum rent and royalties varying with the quantity of the coal worked. The fixed or dead rent ensures a minimum return to the lessor and encourages the lessee to work the mine: cf. Halsbury's Laws of England, 2nd ed., vol. 22, pp. 602, 603, where the nature of the practice is mentioned and amplified in the following passage: "A royalty, in the sense in which the word is used in connection with mining leases, is a payment to the lessor proportionate to the amount of the demised mineral worked within a certain period. Usually the royalties are made to merge in the fixed rent by means of a provision that the lessee may, without any additional payment, work, in each period for which a payment of fixed rent is made, so much of the minerals as would, at the royalties reserved, produce a sum equal to the fixed rent." The lease declared upon is of this description. The words "goods produced" in par. (b) of the definition of "service" are of the widest possible application. It would indeed be surprising if they did not include fuel and basic natural products. "Royalty" stands unqualified in its generality. It is a word of various known applications. The common applications of the word are described by Latham C.J. in McCauley v Federal Commissioner of Taxation [1] : "The word "royalty" is most commonly used in connection with agreements for the use of patents or copyrights and in relation to minerals. In the case of patents a royalty is usually a fixed sum paid in respect of each article manufactured under a licence to manufacture a patented article. Similarly the publisher of a work may agree to pay the author royalties in respect of each copy of the work sold In the case of mineral leases, a rent is reserved by the lease and frequently royalties are also made payable, being sums calculated in relation to "the quantity of minerals gotten" (Attorney-General of Ontario v Mercer [2] ) - in such a case the royalties represent "that part of the reddendum which is variable." Use of the term "royalty" is not, however, limited to patents, copyrights and minerals. The term has been used to describe payments for removing furnace slag from land (Shingler v P. Williams & Sons [3] ), and to payments for flax cut (Akers v Commissioner of Taxes (N.Z.) [4] ), the person paying the royalties becoming the owner of the slag or of the flax" [5] . In his dissenting judgment Rich J. defined the word thus: "In its primary sense, royalty denotes one of the beneficial rights of the Crown, such as the right to bona vacantia, escheats, treasure trove, and so forth. In its secondary sense it denotes a consideration paid for permission to exercise a beneficial privilege, usually made payable as and when the privilege is exercised, and measured by the quantum of the benefit from time to time received from the exercise, for example, by the quantity of minerals won by the exercise of mining rights, or the number of articles manufactured under a licence to use a patent or a secret process" [6] . This being the meaning and these being the characteristic applications of the word it is not easy to suppose that royalties on the production of coal and other minerals were outside the intendment of the paragraph. Once that is granted the next step seems almost inevitable, namely that it covers such royalties whether their character is rent or not. For in the first place the character of rent usually attaches to such royalties. In the second place whether it does so or not is irrelevant to the purpose of the regulations, namely to control charges which would affect the price or cost of commodities and to check some of the factors or incidents of monetary inflation.