The high-and-mighty vitriol which greeted Tom Mulcair's comments last week about the downside of oil-powered currency appreciation is lamentable (repeating the over-the-top reaction to Dalton McGuinty's similar comments a few weeks ago). Mulcair made two modest and empirically substantiated statements: the loonie is sky-high as a result of the oil boom in Alberta's bitumen sands (I doubt you'd find a single currency trader on Bay Street who would disagree with that), and that overvaluation is causing negative side-effects on other industries and regions in Canada.
