By Leika Kihara

TOKYO (Reuters) -As Japanese authorities once again battle a slide in the yen, their efforts this time are struggling for traction, undermined by new prime minister Sanae Takaichi’s promotion of advocates of big fiscal and monetary stimulus to key posts.

While Tokyo officials this week warned against sharp downward moves in the currency, maintaining the jawboning of previous administrations, their voices are increasingly competing with calls by new policy advisers preaching the benefits of a weak yen.

A proponent of expansionary fiscal and monetary policy, Takaichi filled seats in key government panels with advocates of big spending backed by low interest rates – policies that work to depreciate the yen’s value.

For one, Takuji Aida, an economist who joined a panel on t

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