The move by the Peoples Bank of China to lower interest rates Friday bumped up a broad range of stocks across global markets. The PBOC trimmed key short and longer-term interest rates for the first time since 2012, in an effort to shore up what an increasing number of measures show to be a stalling economy. On U.S. markets, Caterpillar’s (CAT) gap-up move in strong volume was the headline responder.