The paper investigates the gender wage gap among recently graduates, controlling for job and academic variables and for the field of study, as women lag behind in highly remunerative majors. The raw gender differential in hourly wages is 5.6%. Although including academic variables and the field of study—on top of job-related variables—slightly reduces the unexplained gap, the latter still accounts for most of the total difference. Using quantile decomposition, the paper shows that the unexplained gap increases along the wage distribution, indicating a glass ceiling effect. Heterogeneities arise among fields of study: the largest total gap emerges in Law, Political-Social sciences, and Economics-Statistics. In most disciplines, there is a significant unexplained gap—from 3.3% (Medicine), to 8.7% (Law), up to 9.6% (Agriculture)—which constitutes the largest share of the difference, confirming that most of the wage gap remains unexplained also by major. Finally, I use geographical differences to explore the influence of institutional and macro-economic variables, as well as of attitudes towards gender norms. The results indicate that childcare and part-time employment availability are correlated with lower gender wage gaps, while traditional gender norms are associated with higher differentials.
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There are other additional differences: (i) I use wages per hour as a dependent variable, while Anelli and Peri (2015) have only information about income per year; (ii) I consider recently graduated individuals, while they have a pooled sample of people who graduated between five and fifteen years earlier; (iv) in the regressions, I include a much larger set of control variables that may reduce the gender gap—detailed in Sect. 4.
I may sometimes use the word ‘effect’ to simplify the exposition, but the reader should interpret the results as correlations.
The field of study control may be endogenous. For this reason, I include it in a subsequent specification, after having included only other academic variables.
Master degree includes both master degrees and single-cycle 5-year degrees, at the end of which the student directly obtains a master degree.
I.e. the student has not completed the degree within the set time period (usually 3 years for bachelor and 2 years for master degrees) (‘fuori corso’).
The variables that should affect labour supply but not wages.
See Vergolini and Vlach (2017) for a description of the Italian educational system.
Math-Sciences includes mathematics, physics, and computer science (distinguished from Natural Sciences).
Not shown, available upon request.
As discussed above as regards the coefficient associated with the gender dummy, also coefficients associated with the field of study should not be interpreted in causal terms, but as partial correlations.
As robustness checks, I estimate the OLS regression and the O–B decomposition (full specification) also on three subgroups: (i) only bachelor students; (ii) only master students; (iii) only students graduated before age 30 (Table 18). In the first group, the raw gender gap is slightly larger (6.2%), whereas in the second and third case it is slightly smaller (4.8 and 4.5%), while the OLS female coefficients are very similar to the one estimated in the main analysis. Moreover, the main conclusions are unaffected: the gender gap is unaccounted for by observable characteristics.
I also estimated the O–B decomposition without any control variable not included in Piazzalunga and Di Tommaso (2016). Also in this case (available upon request), the unexplained gap among graduated students is smaller than in the full population.
Summary statistics are presented in Table 20.
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This article has benefited from the comments provided by Daniela Del Boca, Maria Laura Di Tommaso, Enrico Rettore, and my former colleagues at FBK-IRVAPP. I would like to thank the editor and the referees for their time and valuable remarks.
This Appendix complements the description of selection into employment (Sect. 4.1 of the paper).
In the paper, I present descriptive evidence that the differences between employed and not employed individuals are similar among men and women, with few exceptions. Moreover, there are distinct types of selection taking place. Individuals do not work because of:
further investment in human capital: individuals who continue to study or are engaged in some form of paid training;
unemployment: individuals who cannot find a job;
general inactivity: individuals who do not work for personal reasons or other reasons.
Distinct types of selection have different—sometimes opposite—effects on the characteristics of employed individuals. Employed people are more likely to have studied subjects with a high degree of employability (such as Engineering and Economics-Statistics), but are less likely to have top grades, to come from academic high-school tracks, and from advantaged socio-economic backgrounds.
Overall, these channels operate similarly for men and women, but some differences emerge. However, such differences are likely to be due to the different sorting of men and women into different fields of study. To provide additional evidence on these aspects, I complement the evidence presented in the main text of the paper with additional analysis.
First, I estimate the following linear probability model, where the dependent variable is a dummy variable which takes value 1 if the individual is employed, 0 otherwise (E):
where F is a dummy variable equal to 1 if the individual is a woman, D is a vector of demographic control variables, B is a vector of individual background variables, S is a vector of family socio-economic background, BA is a dummy variable equal to 1 if the individual has completed a bachelor, FOS is a vector of field of study variables, A is a vector of the remaining academic controls, and e is the random error. \(\delta \ldots \delta _8 \) are the parameters to be estimated with OLS. Equation B.1 is estimated for the pooled sample and for men and women separately.
The results are presented in Table 23 (selected coefficients). Women have a lower probability than men of being employed, even when including several control variables. Among people who completed a master (or single-cycle) degree, graduates in Engineering enjoy the highest employment probability, while the lowest is for graduates in Law, Humanities, Modern Languages, but also Natural Sciences. For women, there is a significantly lower probability also in Agriculture and Psychology. The negative result for Medicine is discussed hereafter.
The total effects of having a bachelor degree—instead of a master—by field of study are reported in Table 24, to simplify the interpretation of the coefficients. In all fields, having a bachelor reduces the probability of being employed, with the largest drop in Pharmacy, Engineering, Architecture, Law, and Psychology. The opposite is true for Medicine: a bachelor has a positive effect on the probability of being employed compared to a master in the same field of study. Bearing in mind that Medicine includes all health-related subjects, this effect is driven by people with a degree in medical professions, such as nurses, midwifes, speech-therapists, physiotherapist, etc..., where women tend to be over-represented. On the other hand, the negative effect of a master/single-cycle degree is driven by people with a degree in Medicine strictly speaking, which requires a formal and paid speciality training after graduation.
Due to the different possible post-degree paths of not employed individual, one would like to understand whether individual characteristics explain the different outcomes, and not only the probability of being employed. To address this question, the post-degree condition can be modelled as a discrete unordered-choice model, where the choice depends on individual characteristics. The model is estimated with a multinomial logit (MNL) model.
After obtaining a degree, an individual can be in the following conditions (C):
The MNL model is given by:
where the controls are the same characteristics mentioned above. The MNL model is estimated by maximum likelihood.
Table 25 reports the results, in terms of marginal effects, for selected characteristics. Being a woman increases the likelihood of being unemployed or inactive, while it lowers the likelihood of being employed. Having a bachelor degree increases the likelihood of studying and lowers the probability of being in paid training or employed. Graduating with top grades increases the probability of being in paid training, and decreases the probability of being unemployed.
Different fields of study have a different impact on the possible outcomes. For instance, Natural Sciences, Political Sciences, Humanities, Modern Languages, and Psychology increase the unemployment probability. On the other hand, Natural Sciences, Medicine, and Law increase the likelihood of being in paid training.
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Piazzalunga, D. The Gender Wage Gap Among College Graduates in Italy. Ital Econ J 4, 33–90 (2018). https://doi.org/10.1007/s40797-017-0069-8
- Gender wage gap
- Oaxaca–Blinder decomposition
- College graduates
- Quantile decomposition
- Field of study
- Regional differences