Bank of Japan board member Yutaka Harada warned that raising interest rates quickly would severely damage financial institutions, underscoring market views that the central bank would go slow in exiting crisis-mode stimulus.

However, Harada, a vocal advocate of bold monetary stimulus, noted the degree of easing could weaken before inflation reaches the BOJ's 2% target. The central bank needed to examine both the costs and benefits of its easy-money policy, he said.

Harada noted that inflation maintained its momentum due to a tightening output gap, and could reach 2% if the jobless rate fell below 2% from the current 2.2% - a near 26-year low.

The BOJ estimates Japan's output gap at a decade-high of plus 1.71% - meaning actual demand in the economy exceeded its maximum potential capacity by that much.

"If interest rates are actually hiked, that would lower bond and stock prices, hurt businesses through a rise in the yen, and increase credit costs, which would hit financial institutions hard," Harada said .

Harada, a former academic, has voted with the majority of the BOJ's board including its decision in 2016 to shift to targeting interest rates instead of the pace of money printing.

The central bank should continue its current easing policy, which is having its intended effects, in order to achieve its 2% inflation target, Harada said. Further easing would be needed if inflation pressure subsided, he added.

The BOJ is seen lagging well behind other central banks in unwinding crisis-mode stimulus, but investors expect no further easing because of concerns that its massive money printing is hurting the bond market and bank profits.

The central bank is likely to cut its price growth forecasts at a policy meeting ending on July 31 as long-term inflation expectations stall. At that meeting, the central bank's board will conduct a quarterly review of its long-term growth and price projections, and scrutinise why inflation remains stubbornly weak.

Annual core consumer inflation, which includes oil products but excludes volatile fresh food costs, held steady at 0.7% in May, well below the BOJ's 2% target.

"To achieve the 2% price goal, the current jobless rate needs to fall further," Harada said. "That doesn't mean that we should continue monetary easing until the jobless rate hits 2% though."

Harada is considered as among those on the nine-member board who promote the positive effect that massive injections of money could have on the economy and inflation, rather than emphasising the demerits of prolonged easing such as the hit to banks' margins.

Still, he has steered clear of calling for ramping up stimulus, distancing himself from the view of board member Goushi Kataoka who argues the BOJ should ease further to ensure its price goal is met quickly

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