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Title: Rise of the Machines: The Effects of Labor-Saving Innovations on Jobs and Wages

Citation Type: Miscellaneous

Publication Year: 2013

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Abstract: Job polarizationthe rise in employment shares of high and low skill jobs at the expense of middle skill jobsoccurred in the US not just recently, but also in the late nineteenth and early twentieth centuries. We argue that in each case polarization resulted from increased automation, and provide a theoretical explanation. In our model, firms deciding whether to employ machines or workers in a given task weigh the cost of using machines, which is increasing in the complexity (in an engineering sense) of the task, against the cost of employing workers, which is increasing in training time required by the task. Insights from artificial intelligence and robotics suggest that some tasks do not require training regardless of complexity, while in other tasks training is required and increases in complexity. In equilibrium, firms are more likely to automate a task that requires training, holding complexity constant. We assume that more-skilled workers learn faster, and thus it is middle skill workers who have a comparative advantage in tasks that are most likely to be automated when machine design costs fall. In addition to explaining job polarization, our model makes sense of observed patterns of automation and accounts for a set of novel stylized facts about occupational training requirements

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Authors: Graetz, Georg; Feng, Andy

Publisher: London School of Economics

Data Collections: IPUMS USA, IPUMS CPS

Topics: Labor Force and Occupational Structure

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