In the twenty-first-century digital world, virtual goods are sold for real money. Digital game players happily pay for avatars, power-ups, and other game items. But behind every virtual sale, there is a virtual economy, simple or complex. In this book, Vili Lehdonvirta and Edward Castronova introduc[...]

Private currencies have always existed, from notes printed by individual banks to the S&H Green Stamps to Bitcoin. Today's economy has seen an explosion of new forms of monetary exchange not created by the federal government. Credit card companies offer points that can be traded in for a variety of [...]