Mitchell S. Hoffman

Learn More
Training by firms is a central means by which workers accumulate human capital, yet firms may be reluctant to train if workers can quit and use their gained skills elsewhere. " Training contracts " that impose a penalty for premature quitting can help alleviate this inefficiency. This paper studies training contracts in the U.S. trucking industry where they(More)
BACKGROUND More than two-thirds of women who undergo surgery for suspected ovarian neoplasm do not have cancer. Our previous results suggest phospholipids as potential biomarkers of ovarian cancer. In this study, we measured the serum levels of multiple phospholipids among women undergoing surgery for suspected ovarian cancer to identify biomarkers that(More)
Employee referrals are a very common means by which firms hire new workers. Past work suggests that workers hired via referrals often perform better than non-referred workers, but we have little understanding why this may be. In this paper, we demonstrate this is because referrals allow firms to select workers better-suited for particular jobs. To test our(More)
Instrumental voting models predict that turnout depends on the chance of casting a pivotal vote, which is typically extremely low in large elections. Evidence from psychology and behavioral economics suggests that misperceptions of extremely unlikely events are common and subject to systematic biases, sometimes called the non-belief in the law of large(More)
Any opinions expressed here are those of the author(s) and not those of IZA. Research published in this series may include views on policy, but the institute itself takes no institutional policy positions. The Institute for the Study of Labor (IZA) in Bonn is a local and virtual international research center and a place of communication between science,(More)
It is shown that the label "mental disease" derives from value judgements made by the labeller, and that science alone cannot determine the ultimate validity of these judgements. Hence, the term must be, in a genuine sense, based on social and moral convention. However, it is argued that this does not necessarily mean that the medical model, as contended by(More)
  • 1