Yen to strengthen on coordinated intervention.
The U.S. joined Japan's yen-buying intervention because Japan is making serious efforts to correct the yen's undervaluation, and the U.S. is optimistic about Japan's policy path. A stable yen is crucial for regional stability; if it weakens, other currencies like the Korean won would face excess volatility, and the Chinese RMB is already considered undervalued. Policies, including budget discipline and a coming primary surplus, support the yen returning to a normal equilibrium.