"Yes, she said sitting a little straighter in her chair, "its simply good business for me to expect that customers would pay for their daycare spot, whether or not they decide to use it. I get up, don't I? and turn over my OPEN sign? Its not like I get to decide whether or not to work that day, right?"
WRONG! WRONG! WRONG!
Why, just that morning she had decided quite spontaneously to change her work hours. She resolutely slept through one alarm clock, two phone calls, and three knocks on the door.