Do you remember when you went to the store the cashier would enter each transaction in to the register individually and it there would be times where she would have to look up the price of something in a book or call somebody over. Well almost every product today has a bar code on it and they price is coded into a computer. So all the cashier has to do is scan the code and the price will come up. Well there are various types of codes and various types of scanning systems like POS systems. Accuracy and proper entry of prices in to the computer data base is important for an efficient service to customers. I like the speed and I even like the ability of self-check out in those stores that offer that service. Bar codes have made it easier to shop and in some ways simplified it.