Former U.S. Fed Chair Yellen among those appearing at Biden economic briefing

Former Federal Reserve Chair Janet Yellen is among those who appeared at a briefing on the economy for U.S. Democratic presidential candidate Joe Biden, his campaign disclosed on Thursday.Yellen, who ran the U.S. central bank from 2014 to 2018, appeared by video at the first joint economic briefing attended by both Biden and his new running mate, Senator Kamala Harris.Harris joined the regular briefings that Biden takes on both the public health and economic consequences of the coronavirus crisi