It was submitted that since the Commonwealth Parliament has power to make its enactments retrospective, it could retrospectively amend the Commonwealth Act, so as to indicate an intention not to exclude the operation of the State law, and thereby cause the Anti-Discrimination Act to have a valid operation from its inception, notwithstanding that in truth it was inconsistent with the Commonwealth Act at all times before the Amendment Act was passed. The acceptance of this argument would mean that the Commonwealth Parliament could enact a law which would retrospectively deprive s. 109 of the Constitution of its operation. If, at a particular time, a State law was inconsistent with a law of the Commonwealth, s. 109, applied at that time, would have resulted in the invalidity of the State law. If, on the other hand, the State law was not inconsistent with that law of the Commonwealth, s. 109 would not render it invalid. If the respondents' argument were correct, the Commonwealth Parliament could retrospectively reveal that the Commonwealth law had an intention, which it lacked at the earlier time, either to cover, or not to cover, the whole field, with the result that the State law would be retrospectively invalidated or validated. In other words, the Commonwealth law itself could vary the effect which s. 109 had produced at the relevant time; it could give to a State law a valid operation as at a time when s. 109 had rendered it invalid. But Commonwealth statutes cannot prevail over the Constitution. The deeming provisions in sub-ss. (1) and (2) of s. 6A do not state the effect which the Anti-Discrimination Act in truth had before the Amendment Act was passed; what they do is to create a "statutory fiction", to use the well-known words to which reference was made by Windeyer J. in Hunter Douglas Australia Pty. Ltd. v. Perma Blinds [10] . Before the Amendment Act came into effect, the Commonwealth Act, on its proper construction, was intended to be a complete and exclusive statement of the law of Australia with regard to racial discrimination, and Pt II of the Anti-Discrimination Act was inconsistent with that law and therefore invalid by force of s. 109. What the Amendment Act in effect provides is that the Commonwealth Act should now be understood as though it did not have that intention and that Pt II of the Anti-Discrimination Act was therefore not inconsistent with it. In other words, the Parliament has attempted to exclude the operation of s. 109 by means of a fiction. The short answer to the submissions of the respondents is that the Parliament cannot exclude the operation of s. 109 by providing that the intention of the Parliament shall be deemed to have been different from what it actually was and that what was in truth an inconsistency shall be deemed to have not existed. Section 109 deals with "a matter of prime importance" in the constitutional framework (seeButler v. Attorney-General (Vict.) [11] ), namely the effect of an inconsistency between the enactments of two legislatures both of which operate in the same territory. Its provisions are not only critical in adjusting the relations between the legislatures of the Commonwealth and the States, but of great importance for the ordinary citizen, who is entitled to know which of two inconsistent laws he is required to observe. With all respect, I do not agree with the remark of Evatt J. in Victoria v. The Commonwealth [12] , that the section does "no more than declare a rule of last resort". If there is an inconsistency between a law of a State and a law of the Commonwealth there is no other rule than that laid down by s. 109 by which the inconsistency may be resolved. In the present case, since an inconsistency in fact existed, the provisions of s. 109 were called into play and their effect cannot later be excluded by retrospectively declaring that the truth was other than it was.