The man once tasked with keeping the yen stable says, despite the currency's rapid climb, this is not a time for intervention.
Eisuke Sakakibara, Japan's top currency official in the late 1990s, tells CNN's Andrew Stevens that effective, persistent intervention is not possible without the consent of the other currency party, something Japan does not have from the United States at the moment.
"Implicitly, the U.S. is following a weak dollar policy. If they are following a strong dollar policy like Robert Rubin in the 1990s, that is a different story," says Sakakibara, widely-known as Mr. Yen.
He predicts the strong yen is here to stay for some time – and it could even break the mark of 70 yen to the U.S. dollar.
The Japanese yen is considered a major safe-haven currency. In uncertain times, investors flock into the yen and what they see as the relative stability of the Japanese economy, despite its ultra-low interest rates. The "fear factor" for investors has been high in 2011 thanks to the European debt crises and the sputtering in the U.S. economy. That has driven the yen up almost 5% to post-World War II record highs against the dollar.
It's a situation that irks Japanese manufacturers like Toyota or Panasonic. When the yen gets stronger, the companies make less money selling in the major markets of the United States and Europe. more