JPY: Has Japan lost the Currency War?

The currency war “truce” at the G20 meeting in February of this year has effectively placed political pressure on Japan to refrain from further depreciation of the yen. We investigate whether this has frozen USDJPY at its “fair value”. Although a naïve reading of PPP figures suggests that the outcome is reasonable, adjustment for productivity differentials suggests that the yen is now heavily overvalued versus the dollar, with attendant negative consequences for the Japanese economy.