The stock market has a short memory when it comes to tariffs. Investors forget the headlines once they have seen enough of them. That seemed to happen after President Trump spent much of 2025 threatening trading partners with tariffs, delaying them, imposing them, and then negotiating exemptions.
The first announcements rattled stocks, but each subsequent threat produced a smaller reaction. Even “Liberation Day” on April 2, 2025, eventually became a footnote. The S&P 500 fell 11% from April 2 through April 4, according to the Federal Reserve Bank of San Francisco, but the index has since climbed to record territory.
Now tariffs are back in the headlines. And this time, they may matter.
Tariffs Became Yesterday’s Problem
Trump’s first months back in office created repeated bouts of volatility as investors tried to determine whether his tariff threats were negotiating tactics or permanent changes to global trade. The April 2 announcement was the clearest example. The S&P 500 lost 4.8% that day, wiping out $2.4 trillion of market value. Over the following two sessions, the index’s decline reached 11%.
Then came delays and negotiations. The market learned that a tariff announcement did not necessarily mean a tariff would remain in place. The S&P 500 recovered its 2025 losses by May after Trump paused many tariffs and the U.S. and China reached a temporary agreement. The so-called “taco trade” — Trump Always Chickens Out — became a popular meme.
By 2026, tariffs had largely faded into the background. Inflation remains a concern, but the Iran war and enormous spending on artificial intelligence had become bigger market drivers. That’s why the latest announcement stands out.
A 50% Tariff Lands After Talks Collapse
Yesterday, the Trump administration imposed 50% tariffs on roughly $20 billion of Canadian goods after last-minute trade negotiations collapsed. The affected products include plywood, liquor, electrical equipment, furniture, food products, hockey equipment, and other consumer and industrial goods. The tariffs cover about 5% of Canada’s exports to the U.S. The move was particularly surprising because Washington and Ottawa appeared close to a deal only days earlier.
According to Reuters, negotiators had been discussing reducing the U.S. tariff on Canadian-built autos from 25% to 15% and cutting steel and aluminum tariffs by roughly half. Instead, the negotiations collapsed.
U.S. Trade Representative Jamieson Greer said Canada had “upended the careful balance” reached during the negotiations, while Prime Minister Mark Carney called the final U.S. demands unfair and uneconomic.
Canada is not letting the matter slide. Carney has pledged “dollar for dollar” retaliation beginning Sept. 8. Canada’s response will target U.S. products including steel, dairy, electronics, appliances, and agricultural equipment.
The Retaliation Could Matter More Than The Tariff
Trade wars rarely produce perfectly symmetrical retaliation. Canada does not need to put a 50% tariff on the same products Trump targeted. It can choose American industries where Canadian buyers have alternatives and U.S. producers have something to lose.
That puts several sectors in the crosshairs:
| Sector | Potential Exposure |
| Steel | U.S. mills and downstream manufacturers |
| Dairy | U.S. farmers and food producers |
| Electronics | U.S. manufacturers and distributors |
| Appliances | U.S. consumer-goods companies |
| Agricultural equipment | U.S. machinery manufacturers |
| Alcohol | U.S. beverage producers |
The timing also matters because inflation has not disappeared. A new round of tariffs can raise input costs just as consumers and businesses are still absorbing higher prices.
That said, investors should keep the scale in perspective. The newly targeted Canadian goods represent about $20 billion of trade, versus $383 billion of Canadian goods imported into the U.S. in 2025.
Key Takeaway
In short, this is a trade-war escalation, but it is not yet another Liberation Day. The market has already learned to discount Trump’s tariff threats. The S&P 500’s 11% April 2025 decline shows the damage when policy surprises investors; its subsequent recovery to record highs shows what happens when those fears become familiar.
The bigger risk now is retaliation spreading beyond the roughly $20 billion directly affected by Trump’s latest tariffs.
Smart investors should watch Canada’s Sept. 8 response, particularly its impact on U.S. agriculture, machinery, electronics, steel, and consumer goods. If the dispute remains contained, the broader bull market can likely absorb it. If Washington and Ottawa begin expanding tariffs across the roughly $2 trillion North American trade relationship, the calculation changes.
For now, this looks more like a sector-specific earnings risk than a reason to abandon stocks altogether.
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