Evolving Tipping Norms: A Dynamic Behavioural Model with Cross‑Cultural Evidence

Tipping remains a behavioural paradox in economic literature, contradicting classical economic expectations of zero gratuity in one-off transactions. Building a dynamic behavioural model, this study investigates the evolution of tipping norms through individual utility maximisation, incorporating it into a broader cross-cultural context. The model is calibrated on U.S. data to pin the recursive norm parameter and evaluated with an OLS regression of cultural factors across 21 countries. Four major cultural indices—Embeddedness, Affective Autonomy, Intellectual Autonomy, and Cultural Tightness & Looseness—are adopted to understand how national cultural values modulate both the trajectory and strength of tipping norm growth. Comparatively, Embeddedness and Cultural Tightness emerge as the strongest correlations of tipping behaviour, whereas autonomy-oriented dimensions play a modest role. Contrary to conventional beliefs, the expected positive association between cultural tightness and tip inflation is also not supported by empirical evidence, indicating a more complex relationship between formal and informal norm enforcement than previously theorised. Cultures with a higher degree of embeddedness are further statistically shown to experience lower psychological penalties for undertipping. By connecting individual psychology with wider cultural influences, this research offers a cohesive framework for understanding how and why tip-inflation happens.