For the Airlines

We have fifty books, but we’re going to sell sixty. Don’t worry if we run out, because we have other books to substitute.

Sixty steaks are available for sale, but we’ve sold seventy. We’ll see what’s left once the sixty are gone. We’ll give you something, perhaps a hot dog, carrot or chicken nugget.

You chose the lemonade but we only have forty bottles, and we’ve sold forty-five, so we’ll offer you this bottle of water instead. If that doesn’t work, we’ll have more lemonade tomorrow.