HONG KONG -- Chen Lulu, a migrant worker raising a 3-year-old son in the southern Chinese city of Shenzhen, knows where to find a bargain. She buys everything from an umbrella to toilet paper on Pinduoduo, an online shopping site known for cheap products. At the supermarkets of the tech metropolis, the same items are beyond her means.
China's tech boom leaves wide rich-poor chasm
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