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The head of one of Canada’s largest supermarket chains says the vaccine mandate for truckers crossing the U.S.-Canada border is raising the cost of shipping fresh food. But so far, it has had little impact on the retailer’s ability to stock shelves.

Canadian National Railway Co. said it plans to cut spending, streamline management and buy back C$5 billion (about $4 billion) of stock next year as its tries to ward off a shareholder revolt started by TCI Fund Management Ltd.