[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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God just give bosses a loot table. There is no way to farm in this game. You have a set amount of chances per week to get a random exotic drop, not even a drop you want. Put certain guns on certain bosses at certain difficulty levels, make them a percentage drop, and let people go after what they actually want, not what is given to them. I have so many Thunderlords. Why? Because this system is stupid.