Could be some day a classless society? The complex relationship between general cognitive ability and socioeconomic level [ Habrá algún día una sociedad sin clases? La compleja relación entre habilidad cognitiva general y nivel socioeconómico]

Relationships between socio-economic level (SEL) and general cognitive ability have been complex and multifaceted. Research findings are presented in the context of societies that are in the transition period from a traditional model to a contemporary globalized model. Problems associated with so- cial climbing, the search for opportunities and the philosophy of equality are analized from the psychological perspective. Cases are presented from developing world societies. The role of education, social stratification, and the development of specific aptituds, are analized in detail.