I'm trying to imagine this in practice at the local chain grocery store. I think what would happen is crowds of people would lurk at the ends of the aisles faci

I'm trying to imagine this in practice at the local chain grocery store. I think what would happen is crowds of people would lurk at the ends of the aisles facing the registers. In fact, lines would form in the aisles, through which you would have to pass in FIFO order, until you'd earned the front slot that allows you to monitor the formal register lines.