Evolving Traditions Aboard the International Space Station (2003) SpaceRef
Ed Lu: "I'd like to tell the team in Houston a little bit of story if you are ready to hear. I got an email today pointing out that Keith Cowing, the author - or the editor of NASA Watch introduced a story entitled "Why is there money on the International Space Station?".
SXC and Anton Kreil - "The First Trade in Space" via FInancial Times
"In an interview in the latest edition of the London-based publication Square Mile Magazine, Kreil has announced that he will be attempting to become the first person in history to make a financial markets transaction in Space, when he hops aboard the XCOR Lynx MKII shuttle with SXC in 2014."
Keith's note: You're a little late, Mr. Kreil. ISS residents have been exchanging various currencies in space in exchange for services for over a decade. Also, without getting into specifics, every ISS crew member has regular private conversations with their families back home and I know that these conversations have included financial matters. Enjoy your flight - and let me suggest that you do something of far greater value: look out the window.