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The study of human behavior plays a fundamental role in the eld of social science. Starting from the last century, computational ability improvement makes possible to reach fundamental goals in the branch of human interaction;however, scholars have always ignored an essential aspect in this eld, the so-called reciprocity dynamic interaction. This paper attempts to understand the dynamic behind two dierent kinds of decision-makers. The rst one is led by the classical view of rationality, identifiable as the so-called homo oeconomicus(sels agents). By contrast, the second agent involved in this interaction follows a more genuine strategy led by reciprocity behavior (unselsh agents). The innovative approach of this paper is to take into account the fundamental role played by the reciprocity, aiming to get a complete view of the dynamic behind two dierent agents. In order to achieve  the final goal, a prey-predator (Lotka-Volterra) model has been used.

Human capital, reciprocity, dynamic, behavior