MOSCOW, May 11 (RIA Novosti) - Russian goods may become less competitive if the ruble continues to appreciate against the dollar, the head of the presidential administration's expert department said Thursday.

"I have concerns that ruble's appreciation in recent months could reduce the competitiveness of Russian goods and slow down economic growth," Arkady Dvorkovich said.

He added that the Central Bank should determine acceptable appreciation rates and stick to the guidelines.

An acceptable rate relevant to increased labor efficiency would be 8%, Dvorkovich said. But he said the ruble's value must not grow more than 10%, as it did last year.