159.4. In computing income, no deduction shall be made by a taxpayer in respect of an otherwise deductible outlay or expense of the taxpayer for advertising space in an issue of a newspaper for an advertisement directed primarily to a market in Canada unless (a) the issue is a Canadian issue of a Canadian newspaper; and
(b) the issue would be a Canadian issue of a Canadian newspaper were it not that the issue was typeset or printed entirely in the United States or partly in the United States and partly in Canada.