@TechReport{iza:izadps:dp6662,
            	author={Andrews, Martyn J. and Gill, Leonard and Schank, Thorsten and Upward, Richard},
            	title={High Wage Workers Match with High Wage Firms: Clear Evidence of the Effects of Limited Mobility Bias},
            	year={2012},
	month={Jun},
            	institution={Institute of Labor Economics (IZA)},
            	address={Bonn},
            	type={IZA Discussion Paper},
            	number={6662},
            	url={https://www.iza.org/index.php/publications/dp6662},
	abstract={Positive assortative matching implies that high productivity workers and firms match together. However, there is almost no evidence of a positive correlation between the worker and firm contributions in two-way fixed-effects wage equations. This could be the result of a bias caused by standard estimation error. Using German social security records we show that the effect of this bias is substantial in samples with limited inter-firm movement. The correlation between worker and firm contributions to wage equations is unambiguously positive.},
	keywords={fixed effects;linked employer-employee panel data;limited mobility bias},
            }