Beggar thy neighbour

Beggar thy neighbour

America and Canada are two of the most tightly integrated economies on earth. Some $2bn of goods and 330,000 people cross their shared border every day; the components of a single car can travel between the two countries several times before it is finished; and Canada is the largest outside supplier of American energy, steel and aluminium. You would expect governments with a machine this intricate to treat any disruption of it with care. Instead, at one minute past midnight on Saturday, a 50% tariff took effect on about $20bn of Canadian exports, after three days of talks in Washington collapsed on Friday night. This is not, at bottom, a story about tariffs. It is a story about what happens when trade stops being governed by rules and starts being governed by power.

The failure was all the more jarring for how close the two sides seemed. Canadian negotiators had camped out in the American capital, and on Tuesday Mr Trump had paused the new duties for 72 hours, declaring that a very good deal was at hand. On Friday America's trade representative, Jamieson Greer, blamed Canada for a "missed opportunity", citing "new demands and walkbacks" by Ottawa after days of apparent progress. Mark Carney, the prime minister, replied that the terms were insufficient and promised to match the American tariffs "dollar for dollar".

The duties themselves are not the measure of the damage, though they will hurt. They cover roughly 5% of Canada's exports to America: electronics, industrial machinery and dairy, along with an antique list — wine, hockey sticks, cement — that reveals the provenance of the grievance behind them. And they are stacked on top of a 35% tariff on Canadian lumber, a 25% tariff on vehicles and rates of 15–50% on steel, aluminium and copper, so that much of this trade now carries a heavy load of accumulated punishment.

The truly novel thing is not the rate but the instrument. The administration justified the duties under Section 338 of the Tariff Act of 1930, a statute written in the protectionist fever of the Smoot–Hawley era and never once used before. It permits tariffs of up to 50% on any country that a president finds, "as a fact", to be discriminating against American commerce — no investigation required. The proclamation makes the duties apply even to goods that qualify for tariff-free treatment under the United States–Mexico–Canada Agreement (USMCA), the treaty meant to make North American trade predictable; only energy, potash, critical minerals and fish are spared. After the Supreme Court struck down the emergency-powers tariffs in February, the administration reached deeper into the legal pantry.

This is a symptom of a larger change. The complaints underneath are real but narrow. Canada protects its dairy farmers behind quotas and has resisted American access to its market for decades; its provinces pulled American alcohol off the shelves in retaliation; lumber has been a running sore for decades. On the last of these Washington has a respectable case.

Yet the strongest version of the American argument contains the seeds of its own refutation. The Atlantic Council, a think-tank, notes that the collapse in American alcohol exports is substantially a consequence of the tariffs the United States imposed first — retaliation, not original sin. The "discrimination" in the White House's complaint is, to a large degree, the scar tissue of its own protectionism. Tariff-for-tariff produces more tariffs, not fewer, which is why a confrontation begun in 2025 now has nothing to show but higher costs.

The deeper structural fact is asymmetry. By the tally of the Congressional Research Service, Canada sends 76% of its goods exports to America and sources about half its imports from it; the relationship matters more to the smaller country, as every negotiator on both sides knows. Yet the asymmetry cuts against the abuser too. The same supply chains that make Canada desperate for a deal make American factories choke when deals fail. When a president taxes the inputs of his own manufacturers, every border crossing becomes a tax event — and the exemption of energy from the new duties is a quiet admission that the dependence runs both ways.

The politics made the failure close to inevitable. Mr Trump, facing mid-term elections in November, wants a visible triumph, and he has a taste for making the dispute personal: it was an Ontario advertisement mocking his tariff policy that ended the negotiations last October. Mr Carney faces the mirror image of the same incentive. His position rests on not being seen to fold: a petition to expel the American ambassador has gathered more than 200,000 signatures, the provinces that control liquor retailing refuse to lift their alcohol bans — the demand on which this week's talks foundered — and he has promised retaliation "dollar for dollar". When both leaders need to look tough, the pause-and-threaten rhythm of the past week is not a malfunction of the process. It is the process.

The real casualty is not this year's dairy trade but the predictability on which the whole edifice rests. A trade agreement exists so that commitments outlive administrations and arguments do not have to be replayed as threats. By laying a statute from 1930 on top of a treaty it signed, Washington has told every partner, friend and rival alike, that its signature is provisional and its tariffs are a standing option. The second-order effects are already visible. Canadian nationalism is hardening; politicians are using the dispute to push for pipelines and trade corridors that bypass the United States; and a relationship that once ran on trust is being converted into one that runs on leverage. Coercing a neighbour is easy. Living with the resentment is not.

A sane settlement is within reach, and it is oddly small. Canada could end the provincial alcohol bans and open a little more of its dairy market. America could, in return, offer durable relief on lumber, steel and cars — relief that would matter more to Canadian industry than drama staged in 50-point increments. Both leaders could then claim the victories their politics demand. But that requires treating the negotiation as the maintenance of a shared asset, not a trial of strength, and this week the two governments did the opposite. The wall that rose over the weekend will make nothing in North America cheaper, safer or more certain. It is a tax on trust: the one input neither country can replace.