Online betting platform Polymarket is showing strong odds that the Supreme Court may strike down many of former President Donald Trump’s tariffs. In the context of economic uncertainties, such a decision could have significant implications for the stock market.
The anticipation centers around an ongoing legal challenge to Trump’s tariffs, which were imposed using the International Emergency Economic Powers Act (IEEPA). Many had expected the Supreme Court to unveil its decision on this matter last week, but it has been postponed to an announcement scheduled for Wednesday.
Three main arguments underpin the challenges to these tariffs. Firstly, the U.S. Constitution grants Congress the exclusive authority to levy taxes, including those classified as tariffs. Secondly, the IEEPA does not explicitly mention tariffs. Lastly, while Congress has delegated limited powers to the executive branch regarding international trade emergencies, critics argue that Trump’s tariffs do not qualify as emergency measures.
Previous rulings by two federal courts have favored those opposing the tariffs. Polymarket reflects a 72% probability that the Supreme Court will uphold these decisions, and the outcome could hinge on the court’s interpretation of executive authority versus congressional power.
Trump himself commented on the potential ruling via Truth Social, warning that a decision against the U.S. would spell disaster. However, some experts view the ruling as a pivotal moment for maintaining the balance of powers that the Founding Fathers established.
Analysts suggest that if the Supreme Court were to overturn the tariffs, it could lead to a substantial increase in the stock market. Investors may respond positively, seeing the reversal as a pathway to relieving pressure in the job market. Economist Mark Zandi from Moody’s has attributed stagnant job growth largely to these tariffs, noting that a ruling against them could lead to immediate improvements in employment rates. Typically, enhancements in job markets correlate with bullish trends in stock markets.
Industries directly affected by the tariffs, such as toy manufacturer Mattel and sportswear giant Nike, could see meaningful gains as they rely significantly on imports from China. Furthermore, the logistics company UPS stands to benefit due to its extensive trade routes between China and the U.S. However, the sentiment could extend beyond these specific companies, as reductions in tariffs might alleviate inflationary pressures and provide the Federal Reserve with greater capacity to lower interest rates, positively impacting a wider range of businesses.
Despite the optimistic outlook for a stock market surge following a favorable Supreme Court ruling, caution remains warranted. Treasury Secretary Scott Bessent has indicated that the Trump administration might be able to reinstate tariffs via other federal regulations, suggesting that any immediate market gains could be short-lived. Sections 301 and 302 of the Trade Act of 1974 provide a framework into which new tariffs could be quickly inserted, contingent on findings of unfair trade practices by foreign nations.
Overall, while a favorable Supreme Court ruling appears poised to ignite market enthusiasm, the broader economic landscape may see tariffs return in some form, tempering the initial jubilance among investors.

