Next, counsel for the appellant submitted that the case was one for the application of the rule which was stated by Lord Mansfield in Browning v. Morris [1] in these words: "Where the contract is executed and the money paid in pari delicto, this rule" (i.e. the maxim " In pari delicto potior est conditio defendentis ") "certainly holds: and the party who has paid it cannot recover it back But, where contracts or transactions are prohibited by positive statutes, for the sake of protecting one set of men from another set of men, the one, from their situation and condition, being liable to be oppressed or imposed upon by the other; there the parties are not in pari delicto; and in furtherance of these statutes, the person injured, after the transaction is finished and completed, may bring his action and defeat the contract" [2] . This principle has of course been since applied in many cases, one of the most recent being Kiriri Cotton Co. Ltd. v. Dewani [3] , where a tenant had paid a landlord a premium for the lease of premises contrary to the provisions of a rent restriction ordinance. The ordinance, it should be added, provided no remedy which would enable the tenant in such a case to recover the payment from the landlord. Before us counsel for the appellant submitted that the present case fell within this principle. The Prices Act was, he said, passed for the protection of purchasers of land, goods and services; the company was one of that class of persons; it was therefore a case of oppressor and oppressed and his client was entitled to maintain an action to recover the amounts overpaid. I do not agree. The Prices Act was passed for the protection of the community as a whole against the mischiefs of inflation and the community is not a "class" or "set" of men within the meaning of the rule. But there is, in my opinion, a further answer to the argument and it is to be found on an examination of the Act itself. Section 25 (1) forbids the sale of declared goods and the supply of declared services at a greater price or higher rate than that fixed under the Act and s. 31 forbids persons knowingly to pay or offer to pay for any declared goods or declared services a greater price or rate than that fixed under the Act. Under s. 50, any person who commits a breach of the Act is guilty of an offence and liable to a penalty. It is plain that there might be many cases in which a person who bought goods or accepted services at a price or rate in excess of that fixed under the Act would be no less blameworthy than the seller of the goods or the supplier of the services. In such cases, the common law would provide no remedy, as Devlin J. (as he then was) pointed out in Gray v. Southouse [1] . The parties would be in pari delicto. It may well be that it was for this reason that the Act contains two sections enabling the recovery, in certain circumstances, of payments made in excess of those permitted by law. Section 25 (2) provides that "In addition to any other penalty which may be imposed for a breach of subsection (1) of this section the court may order the defendant to refund to the purchaser the difference between the maximum price or rate fixed by or pursuant to this Act and the price or rate at which the goods or services were sold or supplied; and the like proceedings may be taken upon any such order as if it had been an order of the court in favour of the purchaser." And s. 41 is in these terms: "(1) Where consent has been given under this Act to any land transaction or proposed land transaction and the person from whom the land option or lease is to be or has been purchased taken or otherwise acquired accepts or has accepted in respect of the transaction or proposed transaction any consideration in excess of the consideration provided for in the terms of the transaction or proposed transaction as so consented to, the person who has paid or given the excess consideration may, notwithstanding that he is or may be concerned in a contravention of this Act in relation to the transaction, but subject to the next succeeding subsection, recover the amount or value of the excess consideration as a debt from the person to whom it was so paid or given, by action in any court of competent jurisdiction. (2) The court in which any such action is brought may, if in its discretion it considers that the circumstances of the case so warrant refuse to give judgment for the plaintiff, or give judgment for the plaintiff in respect of part only of the amount or value of the excess consideration." I think the word "may" in s. 25 (2) is intended to confer a discretion upon the court notwithstanding the fact that its language differs markedly from that used in s. 41 which is plainly permissive. The word "may" prima facie confers a discretion, a power to do or refrain from doing some act. It is true, as was pointed out in Julius v. Lord Bishop of Oxford [1] , that - and I use the words of Cairns L.C. in that case - "there may be something in the nature of the thing empowered to be done, something in the object for which it is to be done, something in the conditions under which it is to be done, something in the title of the person or persons for whose benefit the power is to be exercised, which may couple the power with a duty, and make it the duty of the person in whom the power is reposed, to exercise that power when called upon to do so" [2] . But - and again I quote the Lord Chancellor - "It lies upon those who contend that an obligation exists to exercise this power, to show in the circumstances of the case something which, according to the principles I have mentioned, creates this obligation" [3] . Bearing in mind the purpose for which the Prices Act was passed, the provisions which make it an offence for a purchaser knowingly to participate in a transaction made illegal by the Act, and the maxim of the common law which is expressed by the phrase in pari delicto, potior est conditio defendentis, I am of opinion that s. 25 (2) confers a discretionary power.