Tariff stops create market risk

The strange part is that the market is no longer reacting only to tariffs. It is reacting to whether a tariff threat will still exist by lunch, because the White House has repeatedly announced duties, delayed them, narrowed them, or replaced them with a different legal tool within weeks or even hours. (tradecomplianceresourcehub.com) That pattern was on full display on April 9, 2025, when President Donald Trump cut new tariff rates for most countries to 10 percent for 90 days, while raising the China rate to 125 percent. The announcement landed after markets had already been hit by the earlier tariff push, so stocks snapped upward on the reversal itself, not on any new trade deal. (cnbc.com) Reuters reported that Trump’s tariff-pause post hit at 1:18 p.m. Eastern time, and that the Standard and Poor’s 500 index jumped 9.5 percent after it. Reuters also found that minutes before the post, traders bought thousands of call options tied to the Standard and Poor’s 500 exchange-traded fund, including 5,105 contracts traded around 1:00 p.m. at an average price of $4.20. (investing.com) A call option is a side bet that a stock or index will rise above a set price before the day ends, so it becomes very profitable when a surprise policy reversal sends prices flying. Reuters said those trades were large enough to draw public calls for investigations, even though market experts also said fast trading in a volatile market can produce lucky timing without any leak. (investing.com) This is what makes the tariff story different from a normal tax change. A normal tariff changes the cost of importing goods, but a stop-start tariff regime also changes the odds of a sudden intraday market swing, which turns every White House hint, court ruling, and social-media post into a trading event. (piie.com) The timeline since early 2025 is full of those swings. Reed Smith’s tracker lists February 2025 tariffs on Canada, China, and Mexico, a delay for some North American duties, April 2025 “reciprocal” tariffs, and then a series of later threats, exemptions, investigations, and legal changes that kept rewriting which goods were actually covered. (tradecomplianceresourcehub.com) Then the courts blew up the legal foundation for a big chunk of it. On February 20, 2026, the Supreme Court ruled that the International Emergency Economic Powers Act does not authorize the president to impose tariffs, which invalidated the tariffs that had been issued under that law. (congress.gov) The administration answered that ruling with a new across-the-board import surcharge under Section 122 of the Trade Act of 1974. The White House said on February 20, 2026 that the new duty would be 10 percent, and multiple trackers note that it took effect on February 24 and expires after 150 days unless Congress extends it. (whitehouse.gov, (atlanticcouncil.org) That means importers are trying to price goods while the legal instrument itself keeps changing. Yale’s Budget Lab estimated on April 1, 2026 that the 2025 tariffs had raised $214.7 billion above the 2022 to 2024 customs-revenue average, pushed the effective tariff rate to 10.6 percent in January 2026, and may now require roughly $165 billion in refunds after the court decision. (budgetlab.yale.edu) For companies that buy parts, sign shipping contracts, or set prices months ahead, that is like being told the toll on a bridge may be $10, $0, or illegal, depending on which memo or ruling arrives next week. The risk is no longer just “Will tariffs be high,” but “Which tariff survives long enough to plan around,” and that is why the policy itself has become a source of market volatility. (tradecomplianceresourcehub.com, (budgetlab.yale.edu))