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This study conducts a comparative analysis of the impact of educational mismatch on Spanish wages. This paper aims to focus on the industrial, construction and service sectors at three levels of disaggregation: sector, occupation and gender.

The over-education, required education and under-education (ORU model), was applied to data from the 2018 Spanish Wages Structure Survey conducted by the Spanish National Statistics Institute.

The industrial sector is the one that best manages over-education by offering the highest returns to each year of over-education. It is also the sector that most values the education of women, particularly those in highly qualified positions.

This study compares the wage effects of educational mismatch in the service, industry and construction sectors. Previous literature has ignored the latter sectors in this field of study, but the results of the present study show that the industrial sectors significantly value and remunerates worker education. Therefore, it may be worthy to focus certain economic and social policies on this sector, to contribute to reducing gender wage gaps and gender employment discrimination in the economy.

The purpose of this study was to evaluate the impact of quality certifications on apparent labour productivity in a sample of hotels in Spain.

In line with Mairesse and Kremp (1993), the theoretical model was based on a Cobb–Douglas production function readapted to the goals of the study.

The descriptive results show that labour productivity increases only when certifications and quality standards specific to the hospitality industry are implemented and the tourist destination is committed to quality. The econometric analysis shows that the hotel category, belonging to a chain, and outsourcing services have a positive impact on labour productivity. In contrast, the location of the establishment in areas other than the coast or the capital city of a province has a negative effect on labour productivity. Of the quality models and certifications studied, only the Spanish Q-Mark certificate significantly improves hotel productivity (an average increase of 23.27 per cent).

These results provide support for the Spanish Tourism Quality System implemented by the Spanish Ministry of Tourism, which has not only attempted to increase the quality of tourism hotels by increasing their competitiveness and performance but also by providing them with a quality certificate that can be used as a marketing strategy in international markets.

The main contribution of this study is to show how the adoption of quality standards and certifications increases or decreases labour productivity in hotels. Given that most of the previous literature has only taken into account quantities, this study adds to the literature by incorporating the concept of quality into productivity issues.