Japan is on an unsustainable path of a strong yen and deflation. The unprofitability of Japan's major exporters and emerging trade deficits suggest that the end of this path is in sight. The transition from a strong to weak yen will likely be abrupt, involving a sudden and big devaluation of 30 to 40 percent.
It will be a big shock to Japan's neighbors and its distant competitors like Germany. The yen's devaluation in 1996 was a main factor in triggering the Asian Financial Crisis. Japan's neighbors must have a strong banking system to withstand a bigger devaluation of the yen.
Japan's nominal GDP contracted 8 percent in the four years to the third quarter of 2011, and six percentage points of that was due to deflation. Without increased government expenditure, the contraction will be one percentage point more. Japan has not seen this kind of sustained deflation since the 1930s.
Without government deficits, Japan's economy will decline much more. Central government bonds and borrowings plus its guaranteed debts rose by 116.3 trillion yen during the period, equivalent to one-fourth of the level of the nominal GDP in the third quarter of 2011. Read More