From Seoul to Wall Street, markets are confronting a question that prosperity tends to defer: what happens when belief outruns evidence? South Korea's chip giants reported extraordinary profits and were punished for it, as investors began to doubt whether the vast sums being committed to artificial intelligence infrastructure would ever find their return. Simultaneously, renewed military confrontation between the United States and Iran sent oil surging past $88 a barrel, raising the specter of inflation at precisely the moment the Federal Reserve prepares to speak. Two separate anxieties — one