This course examines how culture affects economic behavior. It is divided into two units. Unit I introduces the core assumptions of the neoclassical framework and highlights methodological and definitional challenges to grasping the phenomenon. It then reviews in greater depth three models - decision-making, social interactions, and game theory - used to account for cultural influences on individual and collective behavior. Unit II applies these theoretical frameworks to empirical domains, including consumption, savings, labor, firm organization, contract enforcement, property rights, and collective action.