The Powell era has concluded, with Kevin Warsh officially taking the helm. On May 15, 2026, Jerome Powell's second term formally came to an end. Barring unforeseen circumstances, Kevin Warsh, confirmed by the Senate with a 54-45 vote, will assume leadership, beginning his tenure at the helm of global financial decision-making. For the U.S. stock market, which is currently operating at elevated levels, this leadership transition may not be a smooth handover but the start of a profound "paradigm shift." Warsh's proposed reforms center on two main points, both of which could introduce risks to a stock market accustomed to an accommodative environment. First, he intends to reduce the Federal Reserve's massive balance sheet. Since the financial crisis, the Fed's balance sheet has ballooned to approximately $6.7 trillion. Warsh has been critical of this, advocating for a gradual reduction in asset holdings. However, large-scale sales of long-term Treasury bonds could push yields higher, thereby increasing borrowing costs for consumers and businesses. With U.S. stock valuations at historically high levels, this undoubtedly presents a risk. Second, he seeks to alter the inflation targeting framework. Since 2012, the Fed has adhered to a 2% inflation target. Warsh, however, believes that "price stability" should be a state where "no one talks about price changes." This de-digitized, ambiguous definition opens the door to greater policy discretion. Particularly in the current context where Middle East conflicts are pushing energy prices higher and U.S. CPI has risen to 3.8%, such a framework shift could be interpreted by markets as a signal that the Fed is prepared to take more hawkish action. Markets may shift from "pricing in" to "seeking shelter." In the short term following the confirmation of Warsh's nomination, a "Warsh effect" has already emerged in markets: the U.S. dollar has strengthened, and gold prices have plummeted. His appointment has ended the market narrative that the Fed would yield to political pressure to maintain "cheap money." Looking ahead, Warsh also plans to reform the Fed's communication methods, reducing "forward guidance" and potentially even eliminating the "dot plot." He believes these forecasts make policymakers "prisoners of their own words." Critics, however, point out that in an environment where the Treasury Secretary frequently comments and the President exerts continuous pressure, central bank "silence" could equally amplify market uncertainty. For investors, the core risk of the Warsh era lies in the unpredictability of his policies. While his actual moves may not be as aggressive as some market expectations, history shows that every significant shift in policy framework presents a new test for market pricing logic.