"Buy Jupiter!" is a humorous science fiction short story by American writer Isaac Asimov. It was first published in the May 1958 issue of Venture Science Fiction Magazine, and reprinted in the 1975 collection Buy Jupiter and Other Stories. The original title of the story was "It Pays'", though it was never published under this name.
Government officials of the Terrestrial Federation negotiate to sell the use of Jupiter's atmosphere to an energy-based alien race. The beings refuse to reveal their plans for its use and whether or not they are at war with other similar beings. Eventually, the aliens reveal that the markings they wish to suspend in Jupiter's atmosphere are an advertising slogan, to be seen by passing spacecraft. The main Earth negotiator reveals to his colleagues that he has outsmarted the aliens, clearly not experienced advertisers, settling for "larger is better". So when rival beings come to do business, Saturn, with its fancy rings, can be sold for a much higher price.
- Seiler, Edward (1995). "Isaac Asimov's Short Fiction: Science Fiction and Fantasy". Asimov Online.