By s. 9, "for the purposes of an inquiry", the Commission may summon witnesses, take evidence on oath and require the production of documents, books and papers. By s. 13, "for the purposes of an inquiry", the Commission or an authorized officer may require any person to furnish information and answer questions. By s. 15, "for the purposes of an inquiry", an authorized officer may enter upon and search premises and inspect, inter alia, documents, books and papers. By ss. 14 and 17 the Commission is given further powers to obtain information, but these powers are not expressed to be exercisable only "for the purposes of an inquiry". It was submitted on behalf of the Commission in the present case that the only rights which a party to an inquiry has in relation to the conduct of the inquiry are those specifically conferred by s. 8E, and that they do not include the right to see all the material which the Commission obtains for the purpose of the inquiry, to test by cross-examination the accuracy of such material, or to adduce further evidence in answer to it. This is too narrow a view. Section 8F makes it clear that if an inquiry is held, it must be a public inquiry. The fact that the Commission is given, by s. 9, the power, for the purposes of the inquiry, to summon witnesses, take evidence on oath, and require the production of documents does not mean that the Commission can take evidence in private, or, in making its inquiry, have regard to documents which are never made public. The powers are given for the purposes of an inquiry, and the inquiry is to be held in public, subject only to s. 8F(2). The same is true of the powers given by ss. 13 and 15. The powers under ss. 14 and 17 are not limited to the purposes of an inquiry, and so could be used by the Commission to obtain information for use in fixing a price in a case in which the Minister had consented to dispense with the holding of an inquiry, or for the purpose of functions conferred on the Commission by other sections of the Act. But if the Commission obtains material under s. 14 or s. 17 which it wishes to use for the purposes of the inquiry, that too must be publicly adduced, unless it is confidential and falls within s. 8F(2). It is not clear why the powers of the Commission under ss. 13 and 15 are limited, when those conferred by ss. 14 and 17 are not, for the purposes of an inquiry, but the distinction does not assist the argument of the Commission. All four sections enable the Commission to obtain information, but they do not enable the Commission to use it for the purposes of an inquiry unless it is publicly presented or is confidential and comes within s. 8F(2). The holding of a public inquiry would be illusory if the Commission, after solemnly taking evidence in public, could, without notice to the parties, base its decision on material that it had obtained in secret and never disclosed.