数据录入）、打车服务、购物/送货、保洁/洗衣等。Kidscount.org显示的人口普查资料估计，2016年美国成年人的数量为249 747 123。因此，在大约2.5亿成年人中，我们估计8%是2 000万。调查的误差幅度是2.4%，所以更保守的估计是2.5亿的5.6%，即1400万。
6．Kingsley, Gray, and Suri. “Accounting for Market Frictions,”383–400.
7．这两个ID是真实存在的，来自西达尔特的两个MTurk工人。
8．David H. Autor, “Why Are There Still So Many Jobs? The History and Future of Workplace Automation,”Journal of Economic Perspectives 29, no. 3 (Summer 2015): 3–30; Brynjolfsson and McAfee, The Second Machine Age.
10．Melissa Valentine and Amy C. Edmondson, “Team Scaffolds: How Minimal In-Group Structures Support Fast-Paced Teaming,”Academy of Management Proceedings 2012, no. 1 (January 1, 2012): 1, https://doi.org/10.5465/AMBPP.2012.109; Dietmar Harhoff and Karim R. Lakhani, eds., Revolutionizing Innovation: Users, Communities, and Open Innovation (Cambridge, MA: MIT Press, 2016).
11．Coase, “Nature of the Firm,”386–405.
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