French Finance Minister Michel Sapin, attending the talks at a famous hot spring resort in a region badly damaged by the 2011 quake-tsunami disaster, also waved off the idea of countries gaining a trade advantage by manipulating their own currencies.
"Today we are in a cooperation phase, and not in an intervention or a currency war phase," he told AFP.
The G7 group – also including members from Britain, Canada, and Italy – will try to hammer out a strategy for keeping a global recession at bay.
In April, the International
Monetary Fund (IMF) cut its forecast for world growth for the third time in less than a year, as a slowdown in China and other emerging economies raised fears that the worst was yet to come.
"Proactive financial policies and monetary easing are necessary, but not enough," said Ivan Tselichtchev, an economics professor at Japan's Niigata University of Management.
"The G7 has to do more to pursue structural reforms, to raise economic efficiency,...To boost investment, including investment from large emerging countries," Tselichtchev added.
Among those attending the talks this week are US Treasury Secretary Jacob Lew, European Central Bank president Mario Draghi, and IMF chief Christine Lagarde.
The group will meet behind closed doors and tour an area hit by the quake-tsunami disaster on Friday afternoon.
Terrorist financing and offshore tax havens at the heart of the Panama Papers investigation will be discussed.
A debt relief deal for Greece and Britain's referendum on its future in the European Union could also be on the agenda.
"As uncertainty about the world economy
has increased, macroeconomic policies and structural reforms" will be discussed, Japanese Finance Minister Taro Aso told an opening reception yesterday.
"And as we saw with the Panama Papers situation, we are keenly aware that there is a lot of attention focused on things such as tax avoidance and money laundering," he added.
However, finding agreement on how the group can stimulate their own economies, and global growth, could be a challenge.
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