Posen warns markets underestimate BOJ tightening as yen slides past 162

Markets are underestimating the pace of Bank of Japan tightening, according to Peterson Institute economist Adam Posen, a view that challenges consensus expectations for a gradual normalization path.

The Bank of Japan's tightening cycle may be faster than markets anticipate, with the yen sliding past 162 against the dollar as investors underestimate the pace of policy normalization, Peterson Institute President Adam Posen said.

"Investors are still pricing in a gradual, cautious BOJ that will lag behind the curve, but the data and the political dynamics point to a more aggressive path," Posen, president of the Peterson Institute for International Economics, said in an interview Monday.

The yen traded at 162.33 per dollar Monday, near levels that triggered Japan's $70 billion intervention campaign in late April and early May. The currency has weakened more than 12 percent against the dollar this year, defying expectations that the BOJ's first rate hike in 17 years would stem the decline. Benchmark 10-year Japanese government bond yields have risen to around 1.1 percent, while the yield gap with U.S. Treasuries — currently at 4.598 percent on the 10-year — continues to pressure the yen.

If Posen's assessment proves correct, a faster pace of BOJ tightening could upend carry trades that have made the yen the G10's most-shorted currency, potentially triggering a sharp reversal in USD/JPY. Markets currently price just one additional rate hike this year, which would take the policy rate to 1.25 percent, according to ING. The next BOJ meeting is scheduled for July 31.

Rate Path Diverges From Market Pricing

Posen's view stands in contrast to the official stance from Tokyo. Japan has no plans to overhaul pension funds' asset allocation, sources told Bloomberg, suggesting policymakers are not yet preparing for a dramatic shift in the country's investment landscape. The government is leaning on the BOJ not to hike too quickly, according to ING strategists, who note that markets are struggling to price in even one further rate increase this year.

The last time the BOJ surprised markets with a hawkish move was in July 2024, when it raised rates by 15 basis points and announced a reduction in bond purchases. The yen strengthened more than 3 percent in the following week, while the Nikkei 225 fell 5 percent as carry trades unwound. A repeat of that dynamic could be more severe this time, given that speculative short-yen positioning has reached multi-year extremes.

US Pressure Adds to Intervention Risk

Renewed US pressure on Japan's currency policy adds another layer of uncertainty. The dollar index edged up 0.06 percent to 101.12 Monday, with the greenback strengthening 0.4 percent against the yen to 162.33. ING expects further intervention in the July 16-20 window around Japan's Marine Day public holiday, though analysts caution that intervention can only slow the move, not reverse it.

"Intervention can only slow the move," ING strategists wrote in a note Monday. "A reversal will not be seen until either the BOJ hikes aggressively or the Fed turns more dovish."

The Federal Reserve's own policy path complicates the outlook. Markets price almost 40 basis points of Fed tightening by December, up from about 15 basis points in early June, according to swap markets. If the Fed delivers on those hikes, the dollar-yen yield differential would widen further, adding to pressure on the BOJ to accelerate its own tightening.

Posen argues that tighter monetary policy may ultimately be needed even as fiscal spending remains loose, a combination that could test the BOJ's independence and the government's commitment to fiscal discipline. Japan's gross government debt exceeds 250 percent of GDP, the highest among developed economies.

The implications extend beyond Japan. A faster BOJ tightening cycle would ripple through global bond markets, potentially pushing up yields on developed-market sovereign debt as Japanese investors repatriate funds. Japanese investors hold more than $2 trillion in foreign bonds, making them one of the largest cross-border capital flows in the world.

This article is for informational purposes only and does not constitute investment advice.