Few things about Donald Trump’s recent election are causing worse disarray worldwide than the incoming U.S. President’s vow to erect a tariff wall against all imports in order to spur a resurgence in American manufacturing might. Canada’s up to $200-billion-a-year worth of oil and natural gas exports lie at stake, feared to be among the new Administration’s tariff targets. But how strong is the basis for such fears? Probing the political psychology of Trump’s economic and trade poli...
