TY - RPRT AU - Gibson, Matthew TI - Employer Market Power in Silicon Valley PY - 2021/Nov/ PB - Institute of Labor Economics (IZA) CY - Bonn T2 - IZA Discussion Paper IS - 14843 UR - https://www.iza.org/publications/dp14843 AB - Adam Smith alleged that employers sometimes secretly collude to reduce labor earnings. This paper examines an important case of such behavior: illegal no-poaching agreements through which information-technology companies agreed not to compete for each other's workers. Exploiting the plausibly exogenous timing of a US Department of Justice investigation, I estimate the effects of these agreements using a difference-in-differences design. Data from Glassdoor permit the inclusion of rich employer- and job-level controls. On average, the no-poaching agreements reduced salaries at colluding firms by 4.8 percent. Stock bonuses and ratings of job satisfaction were also negatively affected. These estimates are consistent with considerable employer market power. KW - oligopsony KW - employer market power KW - labor earnings KW - monopsony ER -