Can legalizing marijuana help the economy?

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I keep hearing lot of stories about how legalizing marijuana could help our economy. I'm not against legaliztion anyway but i keep wondering if thats really true. Can legalizing really help our economy? And how much could it help? Could it save us or just barely make a dent? In what ways could it help us? I keep hearing all kinds of different things but i'd like to know what you guys think.