All eyes are on the Supreme Court this Friday as it reconvenes to weigh a high‑stakes case on the legality of Trump‑era tariffs an event analysts say could provoke an immediate market reaction. According to research from JPMorgan, any decision on the International Emergency Economic Powers Act (IEEPA) authority could spark a sharp move in the S&P 500, with swings from roughly −1% to +2% in the first moments of trading. Markets have priced in uncertainty for weeks, but the court’s ruling still lacks a clear consensus, making today a true binary event for traders.
This isn’t just another headline. If the court rules against the tariffs under IEEPA, importers and equity markets tied to global supply chains could benefit in the short term, while bonds might sell off initially. But strategists caution that these knee‑jerk moves may fade quickly as the underlying policy battle could continue even after the ruling possibly delaying any durable impact