Supermarkets

In section 48, it talks about how the supermarkets organize the stock of product and barcodes. When the customer buys the product by using cards, the money will automatically deduct from the account. When each product is scanned by using a barcode reader, the number of stock will deduct each time from the central database that controls the quantity of products. The process of the movement of money is called electronic funds transfer (EFT). In the supermarket, the checkout tills are the place where the sale takes price. This place is called point of sale (POS). The checkout tills are connected to the local area network to the wide area network and it makes possible to pay with using cards. This is called electronic funds transfer at point of sale (EFTPOS) For the supermarkets, it is important that shops know how much the stocks are hold. If there is too much stock, the space will be taken a lot inside and there is a risk of not selling all the products before the expiry date. If there is too little stock, the customers will not be happy if they cannot buy what they need. The store uses database to organize the amount of stock by using a barcode scanner. When the product is scanned, the number of product will automatically deduct from the database so the store manager can decide if the reorder is needed. Customers can buy products at online shopping. The latest product will be downloaded to the customer’s computer. When the customer uses the cards for the payment, the money will be deduct from the bank’s account automatically. All the products have barcodes. Barcodes are made out of black and white straight lines. Under the barcode line, the number represents the country of origin, the manufacturer’s number, the product code and the last number represents the check digit.

**Bar Codes** Bar codes are now used widely for storing different kinds of information. As the needs rose the format of the bar codes developed. Now there are the one dimensional and the two dimensional bar codes. The one dimensional bar codes are made of black and white stripes with numbers or letters on the bottom. This can hold about 16 characters of information. It is used for groceries, library cards, etc. The two dimensional bar codes can store up to 2000 bytes of information. It is made of a matrix of square dots. These types of bar codes are used for more complex material, such as tax form or signatures.



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