The sharp and persistent decline in global equity markets—fueled by President Donald Trump’s aggressive tariff policy—is testing the resolve of investors and the stability of the financial system. Since April 1, the S&P 500 has fallen more than 10%, sending shockwaves across asset classes and raising concerns among economists and strategists who are watching closely for early signs of a financial crisis. Although traditional measures of market stress like high-yield credit spreads and interbank funding rates remain relatively stable, the sustained pressure on equities is rattling confidence. “It’s kind of a slow-moving shift in that direction [of a crisis],” said Jens Nordvig, founder of Exante Data. The longer tariffs remain in place, he warns, the more likely pressure will build on the banking sector—and potentially the broader economy. The fear is less about an immediate crash and more about systemic cracks forming under the surface. Unusual movements in both equities and fixed ...