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In the somewhat zero-sum game of trade

And there's the error.

If I didn't value your widget more than my gizmo, I would not agree to trade. (Well, except at gunpoint - but that isn't trade, that's robbery. Or if you're misrepresenting your widget and preventing me from getting an accurate view of it - but that's fraud.)

If you didn't value my gizmo more than your widget, you would not agree to trade.

Therefore, if the trade happens on truthful terms by our mutual free choice, both of us are better off than we would otherwise be. That's a positive sum.
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