Japan is in danger of falling into a recession as the yen’s decline reduces the purchasing power of households and squeezes corporate profits, according to a former deputy governor of the Bank of Japan.

“The current yen weakness is slightly excessive,” Kazumasa Iwata, the deputy from 2003 to 2008, said in an interview last week in Tokyo. ” ‘Abenomics’ entails the risk of ‘beggar thyself’ consequences and signs are already emerging.”

The yen is trading near a six-year low against the dollar as diverging monetary policies from the U.S. to Japan threaten to increase exchange-rate volatility.

Rising import costs are straining the economy as Prime Minister Shinzo Abe weighs whether Japan can take another consumption tax increase to rein in the world’s biggest debt burden.

“Currency levels appropriate for reflecting Japan’s economic fundamentals are ¥90 to ¥100 to the dollar,” said Iwata, now the president of the Japan Center of Economic Research.

The yen touching 109.46 to the dollar on Friday, the weakest since August 2008, according Bloomberg data. It has depreciated by 4.5 percent over the past month, the most among the 16 major currencies tracked by Bloomberg.

Haruhiko Kuroda, the BOJ governor handpicked by Abe in 2012, has said he will do what’s needed to achieve the inflation target as he continues unprecedented easing.

Speaking at a Group of 20 meeting in Cairns, Australia, on Friday after the dollar rose above ¥109, Kuroda said he didn’t see any big problems with current movements in exchange rates.

“It’s important for foreign exchange rates to move in a stable manner by reflecting economic fundamentals,” he said. “It’s natural for it to move in accordance with changes in economic fundamentals.”

The central bank should ease monetary policy further if inflation drops below 1 percent, and needs a more realistic time frame to achieve its 2 percent target, according to Iwata.

“The BOJ should scrap the two-year framework for its price stability goal and extend to five years and stick to it,” he said. “That’s the most that monetary policy can do.”

While the weaker yen has made some Japanese manufactured goods cheaper in global markets, rising import prices also mean higher production and fuel costs.

Consumer prices excluding fresh food — the BOJ’s main gauge — rose 3.3 percent in July from a year earlier, with electricity prices climbing 8.5 percent.

The corporate goods price index, a measure of wholesale prices, rose 3.9 percent in August from a year earlier, a 17th straight increase, with import prices gaining 4.5 percent, according to BOJ data.

Abe should go ahead with a plan to raise the sales tax to 10 percent next year after increasing the levy to 8 percent last April, Iwata said.

If he doesn’t, investors may lose their appetite to buy Japanese government bonds, Iwata said.

Japan risks “secular stagnation” if it fails to boost productivity through its growth strategy, and fiscal collapse if investors turn away from its bonds, he said.

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