NEW YORK, Jan 23 : The yen was volatile on Friday, with two sudden spikes raising market speculation that authorities had conducted a rate check, often a precursor to intervention. The yen was last stronger on the day at 155.855 per dollar. Traders are alert to the prospect of intervention from

NEW YORK, Jan 23 : The yen was volatile on Friday, with two sudden spikes raising market speculation that authorities had conducted a rate check, often a precursor to intervention. The yen was last stronger on the day at 155.855 per dollar. Traders are alert to the prospect of intervention from

NEW YORK/LONDON, Jan 23 : The yen was volatile on Friday, with a sudden spike raising market speculation that authorities had conducted a rate check, often a precursor to intervention, while the dollar was set for its steepest weekly decline since June as geopolitical tensions unsettled investors.The yen