TANSTAAFL

There ain't no such thing as a free lunch. Old saying, but Tanstaafl as a word was popularized by the book _The Moon is a Harsh Mistress_ by Robert A. Heinlein. Example: A. Hey, let's go into that bar--they give away free drinks. B. Tanstaafl, my friend ... What? The food pays for the drinks. If the drinks weren't free, the food would cost half as much. No matter what, someone, somewhere pays.