The Bank of Japan’s policy of yield curve control depends on soft global interest rates and low yields, and in 2018 this centre will simply not hold. As inflation rises, yields too will spike, and the result will be a fantastical plunge in the yen. Ultimately, the central bank will need to resort to QE-style measures, but not before USDJPY hits 150. Saxo Bank's head of FX strategy John Hardy explains why this could be an outrageous prediction for 2018.