Because Guild Wars does make extensive use of a player-driven economy, we at ArenaNet have a responsibility to manage the economy, and we take that responsibility seriously. You might ask: what exactly is our responsibility? Is it to keep prices within a certain range? Is it to maintain price stability? We think that, expressed in its most general terms, our responsibility is to keep the distribution of wealth as fair as possible, so that normal players can afford to bid for items in a player-driven economy. We need to avoid situations where a small subset of players can earn orders of magnitude more gold than the average player, thus driving up prices of rare items to a level where normal players could never hope to afford them.