No. of Recommendations: 1
I agree if you look at it that way. OTOH, if I trade my widget for your gizmo rather than for someone else's gizmo, they are out a widget and I have a gizmo. If widgets are necessary for them, they could offer to buy them from you - unless you have consumed it. So, supply and demand can make it zero sum.

I look at it like this: I can make a widget for $100. And you'll sell me the same widget for $95. Then I'm $5 richer by buying the widget from you. And vice versa.
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