@TechReport{iza:izadps:dp661,
            	author={Strobl, Eric and Walsh, Frank},
            	title={Efficiency Wages and Effort: Are Hard Jobs Better?},
            	year={2002},
	month={Dec},
            	institution={Institute of Labor Economics (IZA)},
            	address={Bonn},
            	type={IZA Discussion Paper},
            	number={661},
            	url={https://www.iza.org/index.php/publications/dp661},
	abstract={Efficiency wage theory predicts that the wage per unit of effort will be lower in intensively
monitored sectors. This wage differential will increase in effort. Using employer-employee
matched data from Ghana we provide evidence supporting this hypothesis.},
	keywords={monitoring;efficiency wages},
            }