@TechReport{iza:izadps:dp11379,
            	author={Azar, José and Marinescu, Ioana E. and Steinbaum, Marshall and Taska, Bledi},
            	title={Concentration in US Labor Markets: Evidence from Online Vacancy Data},
            	year={2018},
	month={Mar},
            	institution={Institute of Labor Economics (IZA)},
            	address={Bonn},
            	type={IZA Discussion Paper},
            	number={11379},
            	url={https://www.iza.org/publications/dp11379},
	abstract={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.},
	keywords={labor markets;oligopsony;monopsony;competition policy},
            }