In the system, prices are stamped or bar coded onto products. one price marketing self service mass marketing

In the self-service system, prices are stamped or bar coded onto products. It's a practice of serving oneself, like most stores in the Western world, buffet restaurants, gas stations, ATMs, and so forth. The price tags stamped on the products or bar coded onto them to allow the customer to choose what they want to buy and then proceed to where the transaction will be completed (Point of sale or point of purchase).