Up and awaySuddenly, talk is back of intervention to stem the yen’s rise SINCE the summer, the yen has shot up against all major currencies. It is now 23.2% higher than last year's low-point against the dollar, 46.7% higher against the euro, and 65% up against the tumbling pound. Manufacturers are screaming. Japanese exports are down by over a third compared with a year ago, and carmakers and elec