"160" as a Trigger Line: Citi Incorporates Exchange Rate into BOJ Reaction Function
Akira Hoshino, head of Citi's Japan market, suggested in an interview that if the yen continues to weaken and the dollar/yen breaks through the 160 mark, the Bank of Japan may be forced to accelerate its rate hikes: possibly raising the uncollateralized overnight lending rate by 25 basis points to 1% as soon as April, with another similar hike in July, and a potential third action by the end of the year.
Core Logic: Negative Real Interest Rates Make Yen "Harder to Recover"
Hoshino explained that the core driver of the yen's weakness is negative real interest rates—key yield levels that remain below the inflation rate. To reverse the exchange rate trend, the BOJ needs to make interest rate conditions more "genuinely attractive," otherwise exchange rate pressures may persist, in turn pushing up import costs and inflation sensitivity.
This explains why the exchange rate is seen as an important variable in policy judgment at the current stage: Against the background of rising living costs, the yen's depreciation has a more direct transmission to inflation, increasing policy attention to the exchange rate-price chain.
Market and Mainstream Expectations: Most Still Bet on "Once Every Six Months," but Pricing is More Aggressive
In terms of timing, market consensus has not fully followed the "three rate hikes" scenario. Reports indicate that many economists prefer a rate hike every six months, with the next hike window around July; however, interest rate swap market pricing is more aggressive—traders tend to factor in at least one hike before July and give a high probability for another before December.
Capital Reflow and Allocation Constraints: Higher Rates Do Not Immediately Equate to Capital Returning Home
Hoshino also mentioned that if key rate levels like the 10-year government bond start to exceed inflation rates, Japanese institutional investors might reconsider their overseas allocations, with some motivation for capital to flow back into domestic fixed-income assets; however, the reality is constrained by the potentially insufficient supply of high-quality domestic assets, which is one reason for the yen's strong "stickiness."
On the exchange rate path, he expects the yen to fluctuate within a range of 150 to 165 against the dollar; in Tokyo session early Tuesday, the dollar/yen was trading near 158, having recently touched a near low of the 160 range.
