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  1. Social Class: A group of people sharing similar economic, cultural, and social characteristics.
  2. Social Mobility: The movement of individuals or groups from one social class to another.
  3. Inequality: The uneven distribution of resources, opportunities, and privileges among social groups.
  4. Stratification Systems: The ways in which societies organize themselves into hierarchical structures.

You can find digital versions or detailed excerpts of his work through the following academic repositories: Miguel REQUENA | Professor (Full) | PhD - ResearchGate

Social Mobility: Discusses how individuals move between strata and the degree of "openness" in modern societies.