"The trend for prices is weak and that's a concern. The outlook for overseas economies is also highly uncertain," said one of the sources, who spoke on condition of anonymity due to the sensitivity of the matter.
"The scale of this budget suggests that Abe's new administration is serious about stimulating the economy," said Masamichi Adachi, a senior economist at JPMorgan Securities in Tokyo and a former central bank official. "It'll be very helpful in the near-time, but the problem in the medium-to-long term is that we have to pay this back."