The group organising the newly formed 'Cafe Economique' in Nottingham wanted an introduction to basic money theory for their first public event on Thursday 30th June and this article, written by Feasta member Brian Davey, was the result. The extended version of the talk, with notes on sources and for further reading, relates basic concepts to what is happening in the world right now, inclusive of the Greek financial crisis, and what should be done about it.