Walmart is taking a direct shot at Amazon and making checkout lanes obsolete

1. If customers are scanning their own goods, doesn't that make it likely they will occasionally, for one reason or another, miss a scan? That's huge for Walmart's margins. $15 total expense per hour labor saved is not that huge a savings.

2. How does this work with items sold by weight? Have they installed new scales that can allow you to select the item weighed create a barcode for the price of that weight of that item?