A major Supreme Court case on tariffs is quietly brewing—and it might just clip the wings of one of Trump's go-to policy weapons. The core issue? Whether the executive branch's tariff-setting authority faces real constraints or operates with near-unlimited discretion. For markets watching this play out, the stakes are bigger than just trade flows. Tariff uncertainty directly ripples through asset allocation strategies, currency volatility, and cross-border capital movement. If the court reins in the tariff tool, it changes how traders price geopolitical risk and how institutions hedge macro exposure. A ruling here doesn't just reshape trade dynamics—it reshapes how we think about policy predictability and market efficiency.