Sony video game unit's profit dives 86% With Sony shares down 17 percent in the same period, the company hopes to reinvigorate the PlayStation by rolling out a new version with more realistic play and more entertainment options, says Michael Pachter, an analyst at Wedbush Securities. Stanford University economist John Taylor, an expert on monetary policy and a former adviser to both Bush administrations and Mitt Romney's presidential campaign, will speak Tuesday evening at the Commonwealth Club in San Francisco.