By Amara Osei

The dollar traded at 159.93 yen by the morning of November 12, a level not seen for more than two months, but its advance toward 160 remains exposed to renewed Japanese intervention (official currency purchases). Traders linked renewed buying to October consumer-price inflation of 0.4%, above the 0.3% forecast, which strengthened expectations of a December Federal Reserve rate increase.

Japan’s Deputy Finance Minister Atsushi Mimura described the recent currency movements as “too rapid” and recalled Tokyo’s summer yen purchases, including one operation conducted jointly with Washington. His warning pushed USDJPY (the number of yen per dollar) to the session low, after which the pair recovered some losses and traded around 159.70.

Why is Tokyo speaking about the exchange rate again?

At the end of July and beginning of August, Japan’s Ministry of Finance spent approximately 15.4 trillion yen buying yen. The intervention helped reverse USDJPY from its July high of 163.99 to 155.20 at the peak of yen strength.

Tokyo also has a domestic inflation reason to resist excessive yen weakness. Bank of Japan data showed that import prices converted into yen rose 24.8% year on year in October.

A weaker yen makes overseas purchases more expensive for Japanese companies, making it harder to contain rising wholesale prices. That cost pressure increases the authorities’ incentive to monitor the exchange rate.

What supports the dollar near 160?

October’s 0.4% consumer-price increase strengthened the case for a Federal Reserve (US central bank) rate increase in December. That expectation reinforced the interest-rate differential (the gap between returns on US and Japanese assets), which supports demand for dollars while US yields remain higher.

The summer intervention sharply reversed the pair’s trend, but by the end of August the dollar’s yield advantage had helped restore 160. That recovery shows how quickly market demand can regain ground when the US rate outlook strengthens.

Can 160 become a ceiling again?

In August, Fresh-Forexcast2004 identified 160 as a benchmark (a reference level) for assessing how long the summer intervention would remain effective. USDJPY remained below 160 during the first sessions after publication, but crossed the threshold by the end of August and reached 160.39 on September 2.

The August sequence shows that 160 has operated as a threshold rather than a dependable ceiling. Traders held the pair below the level at first, but higher US yields restored it by late August, after the summer intervention had briefly reversed the trend.

The November 12 advance represented another test of that boundary after US inflation data exceeded forecasts. FreshForex analysts said USDJPY “may break through” 160 and test 160.40, an area associated with the September 2 high.

For market participants, 160 carries two functions. It is a technical reference tied to the September 2 high of 160.39 and a policy reference tied to Tokyo’s demonstrated willingness to buy yen.

What could stop the rally?

FreshForex also warned that exchange-rate swings could remain sharp near 160. A new warning from Tokyo could quickly reverse the pair, making the 160.40 target vulnerable to official intervention.

The near-term balance favors another test of 160, but the advance remains vulnerable to official action. October’s 0.4% consumer-price increase supports December rate-hike expectations, while the 15.4 trillion yen summer purchase demonstrates intervention risk. Tokyo’s 24.8% import-price increase strengthens its incentive to curb yen weakness, making 160.40 plausible but unstable.