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The purpose of this paper is to estimate the impact of the agglomeration economies as pull factor of international migration between the European Union and the countries involved in the European Neighbouring Policy.

The applied research is conducted in the 1970-2000 period by using a gravitational model and estimated by linear and non-linear models with a wide fixed-effects structure.

The main finding of this work is the fact that increasing urbanisation matters more as a pull factor than improvements in GDP per capita. The interpretation of these results may be linked with the existence of opportunities arising in cities. Besides, immigrants not only look for monetary outcomes from migrating, but also non-economic territorial features.

Few works have analysed previously the role of urbanisation on international migration flows.

The purpose of this paper is to investigate the resource rents–quality-adjusted human capital nexus and the impact of quality of institutions.

For a large data set of 161 countries for the period 1996–2018 (yearly and 4-year periods), fixed effect estimation method is applied to investigate the impact of resource rents on quality-adjusted human capital and the role of quality of institutions on this relationship.

The paper found little evidence on the negative, significant and direct impact of total resource rents on quality-adjusted human capital. However, the results show that the negative effect of resource rents can be mediated by the quality of institutions. This result is robust to a long list of controls, different specifications and estimation techniques, as well as several robustness checks. Therefore, institutional quality seems to play a critical role in determining the indirect impact of natural resources on human capital. Moreover, the obtained results demonstrate that this resource adverse effect depends on the type of resource rents; in particular, high dependency on oil rents in developing countries appears to harm human capital.

The paper shows that it is not obvious that total resource rents decrease human capital and found that the coefficient is no longer significant in the two-way fixed effects model. However, the analysis has emphasized the crucial role of political institutions in this relationship and has shown that countries with higher quality of institutions make the most of their resource rents transiting to a better human capital environment. This result is found to be robust to a list of controls, different specifications and estimation techniques, as well as several robustness checks. In addition, we demonstrate that not all resources affect human capital in the same way and found that oil rents have a significant negative effect on human capital. This is an important distinction since several countries are blessing from oil rents. From this we conclude that the effect of natural resources on human capital varies across different types of commodities. On the other hand, the interaction between institutions and the sub-categories of resource rents shows that oil rents can increase human capital only in developing countries with higher quality of institutions (above the threshold). This result is also still hold while using alternative measures of political institutions.

The results in this paper have important policy implications. In particular, results highlight important heterogeneities in the role resource rents to the economy. As international commodity prices have shown high volatility in recent years, it is important for policy makers to understand the rents. Rents which are the difference between the price of a commodity and the average cost of producing it can have different effects in the economy, including the human capital. It is shown that in countries with low-quality institutions, natural resource rents negatively affect institutional quality, leading to conflicts, corruption and fostering rent-seeking activities. Overall, this reinforces the elite at the power that, obviously, is interested in preserving the status quo. In other words, there is a vicious circle between resource rents and low-quality institutions that impedes institutional change. How to regulate this in the best possible way requires a good understanding of how resource rents are generated and appropriated for different sectors, their different effects and how people react to these rents. The evidence suggests the policy toward better political institutions may help countries to improve social outcomes such as health and education which offer high social returns.

The paper is part of the author's PhD research and is an original contribution.

The purpose of this paper is to visualize the inter‐university and international collaboration networks generated by Spanish universities based on the co‐authorship of scientific articles.

The approach takes the form of formulation based on a bibliometric analysis of Spanish university production from 2000 to 2004 as contained in Web of Science databases, applying social network visualization techniques. The co‐authorship data used were extracted with the total counting method from a database containing 100,710 papers.

Spanish inter‐university collaboration patterns appear to be influenced by both geographic proximity and administrative and political affiliation. Inter‐regional co‐authorship encompasses regional sub‐networks whose spatial scope conforms rather closely with Spanish geopolitical divisions. Papers involving international collaboration are written primarily with European Union and North and Latin American researchers. Greater visibility is attained with international co‐authorship than with any other type of collaboration studied.

Impact was measured in terms of journals rather than each individual paper. The co‐authorship data were taken from the Web of Knowledge and were not compared with data from other databases.

The data obtained in the paper may provide guidance for public policy makers seeking to enhance and intensify the internationalization of scientific production in Spanish universities.

The Spanish university system is in the midst of profound structural change. This is the first paper to describe Spanish university collaboration networks using social network visualization techniques, covering an area not previously addressed.

Prisoners with substance use disorder (SUD) are at risk of mental health problems. Given the common co-occurring of psychopathic traits with SUDs, probably because of underlying impulsive traits (Ellingson et al., 2018), this study aims to examine the relation between psychopathy (impulsive antisociality and fearless dominance) and the functioning of incarcerated individuals with SUD. The authors investigated whether impulsivity (motor, nonplanning and attentional) can account for the relationship between one psychopathy facet (impulsive antisociality) and craving and mental health problems.

The authors assessed self-reported impulsivity, psychopathy, craving and mental health problems in 121 male incarcerated individuals with SUD and calculated cross-sectional linear regression analyses and mediation models.

Impulsive antisociality was positively related to all impulsivity facets, craving and mental health problems. Attentional impulsivity mediated the relationship of impulsive antisociality with craving and mental health problems. Fearless dominance was related to lower attentional and nonplanning impulsivity, craving and mental health problems.

Future studies should investigate these relations in longitudinal studies and evaluate tailored approaches, for example, mindfulness interventions.

Interventions to reduce craving and improve mental health might be important for those who display self-centered, antisocial behavior but are less relevant for those with fearless, dominant interpersonal behavior. Addressing attentional impulsivity may be of special interest in this regard.

To the best of the authors’ knowledge, this study was the first to investigate the mediating role of different impulsivity facets for the association of impulsive antisociality with craving and with mental health problems in incarcerated individuals with SUD.