Wall Street opens the week with a trade war it did not expect to have.

US stock futures were mixed early Monday. Futures on the S&P 500 slipped 0.22% to 7,674.25, while Nasdaq 100 futures fell 212.25 points, or 0.72%, to 29,175.50. Dow futures were nearly flat at 53,306.00, down 0.09%. Russell 2000 futures were unchanged. The Cboe Volatility Index climbed 5.2% to 15.92, a modest but telling move after a week in which all three major indexes lost ground.

Friday itself had looked like a recovery. The S&P 500 rose 33.21 points, or 0.4%, to 7,674.37. The Dow gained 517.80 points, or 1%, to 53,277.01. The Nasdaq Composite added 113.29 points, or 0.4%, to 26,180.45. It was not enough to save the week: the S&P 500 finished down 1.4%, the Dow 0.8% and the Nasdaq 2.1%.

Why US-Canada trade talks fell apart

Negotiations between Washington and Ottawa collapsed late Friday night, and both sides confirmed that steep new duties would take effect. The measure is a 50% tariff invoked under Section 338 of the Tariff Act of 1930 — a provision no president had ever used since it became law — covering alcohol, hockey equipment, cement, clothing and dairy products. Energy, potash and critical minerals were carved out. The tariffs had originally been scheduled for 12:01 a.m. ET on August 19 and were postponed three days after the White House said a deal was in hand.

There was no deal. Canadian Prime Minister Mark Carney recalled his negotiators and suspended talks, telling Canadians in remarks delivered from Ottawa on August 22 that Washington had moved the goalposts: «they asked too much and offered too little.» He confirmed that Ottawa «will match Washington’s new tariffs dollar for dollar,» targeting steel, dairy, appliances, agricultural equipment, pulp and paper, and electronics, with the measures taking force on September 8. Canada also has a $25 billion support package for exposed workers and businesses.

The scale matters more than the product list. Two-way trade between the two countries totaled $376 billion in the first half of 2026, according to Census data — double the figure with China and second only to Mexico. NBC News reported the new US duties hit roughly $20 billion of Canadian imports. Investors who have spent a year treating headline tariff threats as negotiating theater now have to price the version that actually clears customs, and the version where the counterparty responds. As money.it International has argued, tariffs are bad policy but effective politics — the cost lands on importers and, eventually, on domestic consumers.

Bessent’s «economic D-Day» and the oil trade

The second policy shock arrives this afternoon. Bessent is scheduled to hold a news conference at 2 p.m. ET to detail a sharply expanded sanctions campaign against Iran, after previewing it in a weekend Financial Times op-ed as «an economic D-Day — the single greatest financial offensive ever marshalled against an adversary.» The expected mechanism is a heavy escalation in secondary sanctions aimed at third parties that move Iranian oil, which is precisely the kind of measure that turns a regional conflict into a global compliance problem for banks and shippers. It is the newest front in the economic cold war every investor should understand.

Crude did not react the way a supply-threat headline would suggest. WTI for October delivery fell 1.52% to $85.74 a barrel in early Monday trading, and Brent slipped to roughly $91 as the contract rolled to November. Gold added 0.27% to $4,693.10 an ounce.

Bonds, Nvidia and Wednesday’s inflation print

The bond market remains the week’s real center of gravity. The 10-year Treasury yield has been hovering near 4.7% after a jumpy stretch that pressured equities all last week, and supply is heavy: Treasury sells $69 billion of two-year notes Tuesday, $70 billion of five-year notes Wednesday and $44 billion of seven-year notes Thursday. Weak demand at any of those auctions would revive the pressure that made last week uncomfortable for stocks.

Wednesday is the collision point. The Bureau of Economic Analysis publishes July personal income and outlays at 8:30 a.m. ET, including the Fed’s preferred inflation gauge. In June, the BEA reported that «excluding food and energy, the PCE price index increased 3.3 percent from one year ago» — still well above target. That gap is why three policymakers dissented in favor of a quarter-point hike at the July 28-29 meeting, which left the federal funds rate at 3.5% to 3.75% for a fifth straight time. That same afternoon, Nvidia reports after the close. The stock finished Friday at $214.72, down 0.98%.

Fed Chair Kevin Warsh then closes the week with his first Jackson Hole address as chairman. The Kansas City Fed’s symposium runs August 27 to 29.

What to Watch for the Open

  • Rate-sensitive and trade-exposed names. Autos, machinery, building materials, packaging and consumer staples with Canadian supply chains are the first-order casualties of a 50% duty.
  • The 2 p.m. ET Bessent press conference. Energy, shipping and bank compliance costs all key off the scope of secondary sanctions.
  • Tuesday’s $69 billion two-year auction. The short end is where a hawkish repricing would show up first.
  • Nothing on the US data calendar today. With no scheduled releases Monday, headlines will set the tone by default — which is exactly how gap risk builds into Wednesday.