[spoiler]Destiny does [b][u]NOT[/u][/b] need a Trading System, it needs better economy.
To people saying there is no economy without trading...
[spoiler][b]You have vendors. You can buy items for specific currencies and sell them to get materials and other currencies from dismantling. [/b][/spoiler]
Bungie added material exchange.
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I'd rather trade with any player I want, any time I want, for whatever I want, than to place my hopes in Bungie and the random crap the vendors would have once a week or whatever.