PurposeThis study examines the relationship between rationality and creativity by means of social identity theory for the Greek society (2019–2020).Design/methodology/approachThe outline of the social identity was given through self-categorization via a distributed questionnaire. The types of behavior (rational, nonrational and loss-averse) were determined by using questions based on the Allais paradox. Principal components analysis (PCA) is used to extract the causal relationships.FindingsThe study findings demonstrate that rational individuals are more prompt to creative personality than nonrational individuals. Rational individuals are motivated to pursue creativity through life-improvement goals. Loss-averse individuals are driven through the contradictive incentive of adventure-seeking behavior without, however, being willing to easily give up their established assets.Originality/valueThis article contributes by explaining creativity among rational, nonrational and loss-averse individuals as a product of social identity theory. This contributes to the literature, by proposing that the application of social theories in economics could constitute a different foundation for economics. This refers to the notion of the social microfoundations of the political economy and macroeconomics.