A research assistant will visit corner stores and supermarkets in Prague, pick two items (such as muesli bar and bottle of water) and purchase them by offering a cashier a fistfull of change, telling him / her in English: “Sorry, I don’t know the change, can you pick it for me, please?”. Then, the cashier will pick the change, the assistant will collect the rest of it, take the purchased items and leave. After leaving the store, the assistant will take a note of following variables: name of the store, its location, time of the visit, price of the purchased items, value of change left, number of other customers in the area of the cash desk, number of cash desks, estimated age and gender of the cashier, his / her own gender and any additional notes concerning the interaction. The change offered to cashier will always consists of change of following values: 3x 50,-; 4x 20,-; 3x 10,-; 4x 2,-; 3x 1,- (total value: 271 CZK). The picked items will be in a price range from 31 CZK to 49 CZK. The main variable of interest is the difference between the price of the purchased items and the change actually taken by the cashier, that is whether he or she will cheat and take more change than he or she should. The visits will be made in two different times of the day: in the morning (approx. 9:30 - 11:30 AM) and in the evening (approx. 7:30 - 9:30 PM). Before entering the store, each assistant will randomly decide (by flipping a coin) whether he will be working on his or her smartphone during the payment or not. There will be four different research assistants (two males and two females), all university students. They will wear “I love Prague” T-shirts and speak English, therefore implying they are tourists who do not know Czech change.