Degrees of Separation
This video from Virtualpolitik friend Bernhard Drax uses the virtual world, which has its own virtual economy, Second Life, looks at the multiple ironies involved in another system of virtual economies: the cap and trade system. As Espen Aarseth has already pointed out, capitalism inevitably relies on virtual economies of many kinds, beginning with the contemporary currency system, so this form of abstraction isn't necessarily all that new. Check out how the video also uses information graphics, 3-D simulations, and a number of corporate tools to question corporate influence in the cap and trade system.
Correction: I overlooked sending kudos to VP pals Nonny de la Peña and Peggy Weil for their roles in the project.