Reuters: Global stocks tumbled to one-week lows today, as declines by long-dated U.S. bond yields and a renewal of trade concerns stoked fears of a downturn in the United States, the world’s largest economy. U.S. markets are closed to mark former President George H.W. Bush’s death, but the effect of Wall Street’s turmoil in the previous session, when New York-listed shares tumbled more than 3 percent, was felt in Asia and Europe.