Leaks, riots, and monocles: how a $60 in-game item almost destroyed EVE Online
Such decisions aren't made lightly; CCP employs two full-time economists to keep the economy running as smoothly as possible and to deal with changes such as the introduction of Aurum.
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Fascinating story of the clash between virtual and real-world economics in EVE Online. Despite having fewer users than World of Warcraft (300k vs. 12 million), EVE seems to have created much more sophisticated virtual society.