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The price of unobservables and the employer size–wage premium

João Cerejeira ()

Portuguese Stata Users' Group Meetings 2010 from Stata Users Group

Abstract: In this presentation, I consider the estimation of the employer-size wage effect. I use an estimator that extends the standard panel-data techniques to the case in which the return to permanent component of the error term is differently rewarded across firm sizes. This is a more general model with interactions between time-varying explanatory variables and some unobservable, time-constant variables. I show that a model of this type can be estimated using a nonlinear GMM technique. The results show that some of the observed skills--namely, education, age, and tenure--have high returns in large firms, while the opposite is true for occupations requiring high skill and for the gender gap. On the other hand, the price of nonobserved skills is reduced as firm size increases. This finding is consistent with explanations based on the premise that large employers have more difficulty monitoring workers, which therefore leads them to monitor less closely.

Date: 2010-09-25
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