The administration of Prime Minister Trudeau will implement duties on imports from the U.S. from July 1 in retaliation for America’s section 232 duties on steel and aluminum. That follows a decision by the Trump administration to not grant Canada an exemption and comes as NAFTA talks are in a lull. Canada’s duties include steel and aluminum exports from the U.S. worth $8.2 billion in the past 12 months. American metals exports may be hit by further duties if Canada implements a “safeguarding” regime. Outside of metals the agricultural, food and beverages sectors are hit hardest with $2.2...