If it is a trading system, which I highly doubt it will be, it won't be an in game system. As bungie has never trademarked anything actually in the game. The only things bungie has ever trademarked have been actual release names, and other titles for publishing, such as: Destiny, The Dark Below, The Taken King, etc...
Also the ever-verse trading co. Wasn't even trademarked under software.
As of right now to speculate at any sort of in game trading system would just be foolish and massively jumping to conclusions
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As I said it can lead to speculation =) deej.and the team know it's something we want, whether or not they choose to implement or if so how they choose to is something we won't know yet, hence why I asked the question to start a discussion