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This article originally appeared on Engadget at https://www.engadget.com/big-tech/amazoncom-is-on-the-mend-after-experiencing-technical-issues-211430657.html?src=rss，更多细节参见PDF资料
Erik Brynjolfsson has spent the last several years building one of the most detailed empirical pictures of how technology is reshaping the American workforce—and the picture keeps getting darker for workers at the bottom of the corporate ladder.