Minimum Wages and Employment: A Case Study of the Fast-Food Industry in New Jersey and Pennsylvania: Comment by David Neumark and William Wascher. Published in volume 90, issue 5, pages 1362-1396 of American Economic Review, December 2000

The Interaction of Public Retirement Income Programs in the United States by Elizabeth T. Powers and David Neumark. Published in volume 93, issue 2, pages 261-265 of American Economic Review, May 2003

We design and implement a large-scale field experiment on age discrimination to address limitations of past research that may bias their results. One limitation is the practice of giving older and younger applicants similar experience in the job to which they are applying, to make them “otherwise comparable.” The second limitation is ignoring the likelihood of greater variation in unobserved differences among older workers owing to human capital investment. Based on evidence from over 40,000 job applications, we find robust evidence of age discrimination in hiring against older women, but considerably less evidence of age discrimination against older men.