TOKYO -- The yen is struggling to maintain upward momentum after strengthening past 150 to the dollar for the first time in two months last week, as demand for the greenback outpaces record purchases by speculators.
Interest rates and purchasing power signal potential for renewed sell-off

The momentum of the yen's appreciation is being tempered by demand for dollars. (Photo by Akira Kodaka)
TOKYO -- The yen is struggling to maintain upward momentum after strengthening past 150 to the dollar for the first time in two months last week, as demand for the greenback outpaces record purchases by speculators.