Empresas y finanzas
Fed's Yellen: Clarity key when rates near zero
Yellen's comment, on how to interpret the lessons learned from Japan's "lost decade of growth," appeared in the bank's latest "Economic Letter."
Yellen also said that it was "unclear" if the program of quantitative easing engaged in by the Bank of Japan from 2001 to 2006 "boosted economic activity much."
(Reporting by Ros Krasny; Editing by Theodore d'Afflisio)