Bungie employees have stated there is one already on our discs just waiting to be implemented. So I agree it should be implemented as well as the player driven economy system.
English
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Proof?
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404Architect: There was voice chat and player trading a year ago as well as other player/player interactive elements, as well as a more player-driven economy. The decision to cut voice chat and trading at release was a part of the new "vision" for Destiy.