Japan's repeated attempts to check the dollar's fall against the yen by intervening in the currency market is raising concerns among some economists.
They question how long this strategy can last and are voicing concern that the government may incur huge losses in its dollar-denominated assets if the greenback's value plunges sharply.
"Technically, Japan can carry out as much yen-selling intervention as it wants. But I expect the United States and Europe will not tolerate it anymore, as the operations clearly go too far," said Koichi Haji, chief economist at NLI Research Institute.