Considering that personality traits impact many variables and contexts, the present thesis aimed to verify the predictive power of subjective well-being on impulse buying behavior and on the choice of purchase items, controlling for the effect of personality. To this end, four studies were carried out and data were collected through questionnaires made available on an internet platform. The first study aimed to seek evidence of validity of the Hedonic Shopping Motivations scale. There was satisfactory evidence of validity for the instrument. The measurement of this construct tested correlational and predictive patterns of hedonic motivations on purchase variables, and the results revealed a nomological network that favors more robust theoretical formulations on consumer behavior. The second study consisted of searching for evidence of validity of the Short Affect Intensity Scale (SAIS-BR) for the Brazilian context. This second adapted instrument measures the intensity with which a person experiences emotions, focusing on the consistency of the affective reactions that they usually have when faced with emotional stimuli. The adapted instrument showed satisfactory evidence of validity. Individual differences in affective intensity were associated with personality, frequency of affections and life satisfaction, increasing the knowledge about how affections are experienced and about the impacts of affective intensity on daily life. The correlations found between SAIS-BR factors and dimensions of subjective well-being reinforced the idea that the emotional dimension of subjective well-being refers to both the frequency of feelings and emotions and the magnitude of their expressions. The third study tested the predictive power of subjective well-being, affective intensity, and personality on the tendency to buy impulsively. In addition to corroborating previous findings on the predictive power of negative affects, the results also showed the role of personality factors in this prediction, generating new empirical evidence on impulse buying and subjective well-being in Brazil. The fourth study verified the predictive power of subjective well-being and personality on the preference for experiential and material purchases. The results showed an absence of predictive power of the frequency of affections on the outcome variable, in addition to indicating that some sociodemographic variables and personality traits can predict such individual preferences. Overall, the findings remove part of the burden of responsibility on purchasing behaviors from emotions, indicating a mild impact of well-being on impulsive buying and on product choices. A fundamental importance of this thesis is the production of knowledge that is applicable both to the field of consumer behavior and to the field of positive psychology, highlighting the relevance of interdisciplinarity and transformative consumer research in Brazil.