The customer takes a shopping trolley without to use a coin deposit lock. When the trolley is returned to a row, the customer is automatically entered into a lottery with small daily winnings (an can of coke, an ice cream, a piece of soap, etc.) as well as monthly prizes (for example gift vouchers of different value). The lucky customer chooses his/her prize by touching the Lucky Cart$ screen.
A winning ticket with a bar code as well as a consecutively numbered lottery ticket for the monthly lottery are printed out. The customer takes his chosen prize from its normal place in the supermarket and “pays” with the winning ticket at the checkout counter.