@TechReport{iza:izadps:dp11254,
            	author={Azar, José and Marinescu, Ioana E. and Steinbaum, Marshall},
            	title={Labor Market Concentration},
            	year={2017},
	month={Dec},
            	institution={Institute of Labor Economics (IZA)},
            	address={Bonn},
            	type={IZA Discussion Paper},
            	number={11254},
            	url={https://www.iza.org/index.php/publications/dp11254},
	abstract={A product market is concentrated when a few firms dominate the market. Similarly, a labor market is concentrated when a few firms dominate hiring in the market. Using data from the leading employment website CareerBuilder.com, we calculate labor market concentration for over 8,000 geographic-occupational labor markets in the US. Based on the DOJ-FTC horizontal merger guidelines, the average market is highly concentrated. Using a panel IV regression, we show that going from the 25th percentile to the 75th percentile in concentration is associated with a 17% decline in posted wages, suggesting that concentration increases labor market power.},
	keywords={labor markets;oligopsony;monopsony;competition policy},
            }