But trade is not a zero-sum "game"

Matt Yglesias for Vox: Understanding Trade

More on trade as a positive-sum game.

More on the zero-sum assumption in the context of politics:
Consider Trade and deficits - Yes, if you drive up deficits to an excess, there may be risks to sovereignty.
Similarly, consider Growth and inequality - If you allow excessive wealth inequality, your society will be inferior.  etc etc. 

A nice movie I just watched, titled Arrival, actually has nice lessons on work, science/language, and zero-sum assumptions.  

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