The careening juggernaut that is this increasingly interdependent world’s economy is already subject to enough unpredictable forces as it is: wild weather and war among them.

When reckless politics born of mere personal spite is thrown into the mix, heedless of how it will affect commerce and consumers, that’s an unforced error, with real consequences for real people.

Another such error on the international economic stage is just what President Trump’s recent slapping of an additional 10% tariff on all Canadian goods is.

He ordered the disruptive hike in prices for the entirely capricious reason that he didn’t personally like a television ad produced by the province of Ontario.

When a president of the United States’ fiscal instincts are based on whim, whatever the content of such an ad

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