I don't want to speak on behalf of the CRA this afternoon, but it's fair to say that the CRA certainly employs its audit resources in a comprehensive manner. You have drawn the distinction between international and domestic activities, for example. The CRA would clearly look at both those parts of the tax system, but I can't give you a specific number in terms of an estimate of either underground economy or tax evasion. CRA does not put out a number on those.
On November 18th, 2013. See this statement in context.