Open this photo in gallery: A screen shows news footage of Chinese President Xi Jinping attending a symposium on private enterprises, at a shopping complex in Beijing on Feb. 17.Florence Lo/Reuters President Xi Jinping held a rare meeting on Monday with some of the biggest names in China’s technology sector, such as Alibaba founder Jack Ma, urging them to “show their talent” and be confident in the power of China’s model and market. The tightly choreographed pro-business rally, a turnaround in Beijing’s approach to its tech giants from a regulatory clampdown four years ago, reflected policy makers’ concern about a...