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Sammanfattning: Various research within the field of behavioral economics have proven payment mechanisms to be affecting consumer behavior, giving rise to the question what kind of impact different shopping methods may have. This paper investigates consumer behavior with two different approaches. The first approach is comparing self scanning consumers with consumers using traditional cashier check out, and the second approach is looking at differences between consumers with different individual tendencies to maximize choices. The data set contains 456 individuals and was collected from an experiment conducted in a Swedish grocery store in Malmö and Lund in the fall of 2014. Half of the participants were randomly instructed to do their shopping using self-scanners and after shopping they were all asked to return their receipts and to fill in a short questionnaire about demographics, shopping and scanning experience, personality related statements and mathematical skills. Using a selected combination of OLS-regressions and Probit and Tobit estimations we aim to explain number of utilized offers, time spent in the shop and estimation of money spent. Our main findings are that self scanning consumers are slower, maximizing individuals seem to avoid self scanning while shopping and are faster and seem to plan their shopping more than others.