Sometimes I just leave the store if the line is too long. More often I just don't go, knowing it's going to be too long a wait this time of the day. Perhaps I

Sometimes I just leave the store if the line is too long. More often I just don't go, knowing it's going to be too long a wait this time of the day. Perhaps I am an impatient outlier, but whatever the profitable wait threshold is, it could be maintained with fewer cashiers if checkout were faster.