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In the study of human motivations, self-interest is often seen as a determining factor and opposed to other-interest. Recently a new conceptualization has been proposed in which both interests can occur at the same time. In order to measure these constructs, the Self-and Other-Interest Inventory (SOII; Gerbasi & Prentice, 2013) was created, which has one version for adults and one for students. Due to the absence of similar measurement instruments in Spain, the aim of this work is to adapt the SOII to Spanish university students. Several studies were conducted. First, the construct was analyzed through rational-analytical procedures. Second, the items were translated following an iterative forward-translation design. Finally, evidence of validity was obtained through analytical procedures. Specifically, two pilot studies were carried out in which two independent samples of Spanish students participated (N1 = 119; N2 = 165). In both studies descriptive analyzes of the items were performed, reliability was estimated and the factor structure of the SOII was explored from an exploratory factor analysis. The results showed adequate reliability and a two-factor solution consistent with the original.

Considerable academic debate exists as to whether students with a background in economics exhibit distinct behavioural patterns that set them apart from students in other academic disciplines. Primarily, the debate concerns whether students who fit the stereotype of the economist choose to study economics (the self-selection hypothesis) or whether economics students develop these behavioural patterns in the course of their university studies (the indoctrination hypothesis). We conducted a systematic literature review that examines both hypotheses. According to the literature reviewed, the majority of researchers find the self-selection hypothesis to be the best supported. However, findings remain inconclusive due to several methodological limitations. In spite of that, this study should facilitate a deeper understanding of what causes behavioural changes in economics students and what exactly these behavioural differences are, among other relevant hypotheses.