Because of these multiple and countervailing economic forces, understanding the aggregate and distributional impacts of automation among workers, consumers, and producers is fundamentally an empirical question. To design appropriate policy responses, the relative magnitudes of these mechanisms must be estimated in aunified framework. Despite extensive research, the employment effects of automation remain debated, little is known about the impact of automation on consumer prices and profits, and most of the existing evidence is at the industry level rather than the firm or plant levels, obscuring the channels at play. Data limitations explain the relative scarcity of evidence on these questions, which can only be answered with comprehensive data on automation and the labor and product markets.
In our work, we leverage new micro data on the population of firms and plants in the French manufacturing sector to provide aunified analysis of the effects of automation technologies on employment, wages, prices, and profits between 1994 and 2015. We use two complementary measures of automation technologies, the first based on the balance sheet values of industrial equipment and the second based on plantlevel records of the usage of electromotive force.
We provide descriptive evidence on the population of firms and plants using event studies exploiting the timing of adoption of industrial equipment among plants in the same firm or among firms in the same industry. In contrast with the common view that firms that use more automation technologies reduce their labor force, we find that firmlevel and plantlevel employment increases after automation, including for lowskilled industrial workers.
A causal interpretation of these patterns would suggest that the productivity effect may outweigh the displacement effect, resulting in anet increase in firmlevel and plantlevel labor demand. Moreover, the results also show that the distributional effects of automation in the labor market are subtle. They may occur within each skill group, depending on the sets of tasks performed among detailed occupations, but there is no evidence that automation has abroad effect on inequality.
However, potential unobserved shocks may confound the observed relationships. The event studies show no sign of pretrends, which is reassuring and restricts the potential set of confounders that could explain the increase in employment. Confounding shocks would need to occur simultaneously to explain the increase in automation. Nonetheless, absent aquasi experiment, potential concerns over omitted factors cannot fully be addressed. For example, demand shocks or competition shocks could be at play. Increased demand and increased competition have adirect impact on employment but may also lead afirm to invest more heavily in automation technologies, exactly when the unobserved shock occurs.
To address these concerns, we validate the causal interpretation of the eventstudy results by developing ashiftshare design. We apply this research design to the subset of firms that import industrial equipment from abroad. Identification stems from changes in the productivity of foreign suppliers of industrial equipment over time, which French firms are differentially exposed to through predetermined importersupplied relationships. This identification strategy approximates an ideal experiment that would randomly assign the prices of automation technologies among firms. Because changes in machines qualityadjusted prices are not directly observed, it is convenient to use changes in the market shares of international suppliers over time to infer productivity shocks.
The results with the shiftshare design are closely in line with the earlier results. Firms whose international suppliers of machines become more productive increase their usage of automation technologies and in turn their sales and labor force. We find that sales increase substantially in response to increased automation. In addition, we cannot reject that labor share is unaffected by automation.
These findings are consistent with the role of automations productivity effect. Increased automation allows the firm to expand its sales and scale, which requires hiring additional workers for production. However, the firmlevel relationships may paint amisleading picture because businessstealing effects among firms may affect the industrylevel impacts of automation.
Next we repeat the analysis at the industry level to account for business stealing and other equilibrium effects. We find that the industrylevel relationship between employment and automation is positive on average but that there is substantial heterogeneity depending on exposure to international trade. While the relationship is positive and significant in sectors that face international competition, there is no significant effect in sectors with low exposure to international competition, and we document that the productivity gains from higher automation benefit both consumers through lower prices and firm owners via increased profits.
Finally, we show that the estimated industrylevel elasticities of sales, employment, and prices to automation can be rationalized in asimple monopolisticcompetition model where consumers reallocate demand toward domestic firms with increased productivity and lower prices. The model matches standard estimates of substitution elasticities between varieties produced by different countries for the same industry.
In contrast, it would be difficult to rationalize the industrylevel results on sales and employment in aclosed economy because industrylevel substitution would need to operate between industries (rather than between products produced by either domestic firms or international competitors within the same industry) and would require large price changes, which we do not observe in the data. Competition with international suppliers providing close substitutes explains why the relationship between automation and employment can remain positive even at the industry level, because the response of consumer demand can be large.
Overall, our findings indicate that automation can increase labor demand and can generate productivity gains that are broadly shared among workers, consumers, and firm owners. In an open economy, attempts to curb domestic automation, in the hope of protecting domestic employment, may be selfdefeating because of foreign competition.
NOTE:This research brief is based on Philippe Aghion, Cline Antonin, Simon Bunel, and Xavier Jaravel, What Are the Labor and Product Market Effects of Automation? New Evidence from France, CEPR Discussion Paper No. DP14443, March 3, 2020, https://papers.ssrn.com/sol3/papers.cfm?abstract_id=3547376.
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