The Impact of Immigrant Diversity on Wages. The Spanish Experience

The massive waves of migration that have emerged as part of the recent globalization process have attracted increasing attention in the field of economic geography. Traditionally, empirical research on this issue has focused on the possible substitution effect between native and foreign workers in the labour market. However, this evaluation omits the potential positive spillovers derived from a greater cultural diversity related to immigration. The aim of this work is to fill this gap by analysing the impact that immigrant diversity has on wages in Spain. To do so, we built three different indexes that measure cultural diversity across the Spanish regions. We control for the problem of potential simultaneity between migration and wages using instrumental variable techniques. We also consider the role of the increasing entry of foreigners coming from developed economies and other local factors. The results confirm that a greater diversity of immigrants’ birthplaces is associated with higher wages for both natives and the total population. Moreover, our findings reveal the importance of skilled labour (national or foreign), to encourage workers’ productivity and to ensure sustainable economic development.