Japan is falling into a trap in defending its currency against the US dollar, like Thailand in 1996. Japan’s large forex reserves make the yen a juicy target, rather than deterring currency predators. Its fundamentals are weak and deteriorating, making the yen’s further decline inevitable. Japan can’t raise interest rates aggressively to defend its currency due to its high national debt. It could fall into an inflation-devaluation spiral, greatly profiting yen short-sellers. The yen is trading...