TY  - RPRT
        AU  - Azar, José
AU  - Marinescu, Ioana E.
AU  - Steinbaum, Marshall
AU  - Taska, Bledi
        TI  - Concentration in US Labor Markets: Evidence from Online Vacancy Data
        PY  - 2018/Mar/
        PB  - Institute of Labor Economics (IZA)
        CY  - Bonn
        T2  - IZA Discussion Paper
        IS  - 11379
        UR  - https://www.iza.org/publications/dp11379
        AB  - Using data on the near-universe of online US job vacancies collected by Burning Glass Technologies in 2016, we calculate labor market concentration using the Herfindahl-Hirschman index (HHI) for each commuting zone by 6-digit SOC occupation. The average market has an HHI of 3,953, or the equivalent of 2.5 recruiting employers. 54% of labor markets are highly concentrated (above 2,500 HHI) according to the DOJ/FTC guidelines. Highly concentrated markets account for 17% of employment. All plausible alternative market definitions show that more than 33% of markets are highly concentrated, suggesting that employers have market power in many US labor markets.
        KW  - labor markets
KW  - oligopsony
KW  - monopsony
KW  - competition policy
        ER  -