Business this week

China unveiled proposed antitrust regulations for tech firms. The guidelines would ban activities that regulators think will stifle competition and harm internet users. The list includes controlling user traffic, blocking competitors’ products and discriminatory pricing. The shares of Alibaba, Tencent and JD.com, three Chinese tech giants, all tumbled. Alibaba’s shares in Hong Kong are at their lowest price since they were listed there in 2019.