When the world plunged into recession in 2008, G20 leaders ostentatiously pledged not to repeat the errors of the 1930s. To hasten economic recovery, they would avoid protectionism and keep trade flowing. Canada's government has been among the loudest voices in this free trade chorus.

This is a gross misreading of actual history. World trade collapsed in the 1930s because of collapsing consumer demand, not protectionism; competitive tariffs were a response to that implosion, not its cause. For the same reason, world trade plunged 12 per cent last year, despite the G20 promises.