Have you notice how fast is it paying the items  from the grocery compared about 10 years ago? That is made possible by the barcode and the barcode scanner that the grocery use.  Barcode has made the retailer’s inventory work a lot lighter because once the item has been scanned by the barcode scanner, the computer automatically records the merchandise and it will automatically encoded as sold so no need to input manually all sold items everyday.  That is the power of technology.  It saves time, effort and money, and makes work to be done easier and more efficient.