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Bloomberg Businessweek’s Ashlee Vance heads out into Shenzhen, a city where you can't use cash or credit cards, only your smartphone, where AI facial-recognition software instantly spots and tickets jaywalkers, and where at least one factory barely needs people. This is the society that China's government and leading tech companies are racing to make a reality, with little time to question which advancements are net positives for the rest of us.