The world this week - BusinessJoe Biden held a summit at the White House with the chief executives of America’s biggest tech, financial and infrastructure companies to discuss cyber-security.Those attending included Tim Cook of Apple, Satya Nadella of Microsoft and Jamie Dimon of JPMorgan Chase.Criminal hackers have attacked several critical infrastructure- and software-systems this year.Mr Biden urged companies to help fill the half a million job vacancies in cyber-security.Chinese tech stocks had a good few days, in part because robust quarterly earnings from JD.com, one of China’s biggest e-commerce companies, suggested that it was coping well with the government’s regulatory crackdown on the tech industry.China’s internet giants are making sure they are seen to respond to the latest edicts.Pinduoduo and Tencent, two online platforms, said they would donate billions to worthy causes, after President Xi Jinping pressed high-income enterprises to “return more to society”.The share prices of Uber, Lyft and other gig-economy companies wobbled after a judge in California struck down Proposition 22, a voter-approved measure that allows the firms to continue classifying their drivers as independent contractors rather than workers.
