Several factors explain the wage differential between permanent and temporary workers.
The former receive seniority bonuses and other bonuses linked to productivity or objectives, whereas the latter usually do not. Moreover, the skills required and the responsibilities of the job are usually lower for temporary workers, and basic wages are also different. The simple fact of being a woman means that a worker is worse paid. In particular, the findings are seen as confirming the belief that one of the fundamental reasons for Spain's high level of temporary employment is not the uncertainty of the market but the desire of employers to cut labour costs. For employers, the competitiveness of the Spanish economy demands the reduction of wage costs.