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Re:Becoming a Steelworker Liberated Her, Then Her Job Moved ... by kabulykos on Saturday October 14, 2017 @05:20PM (#15474374)
Lesser divisions of government don't run militaries that might prefer autarky in the event of large conflict.
Re:Becoming a Steelworker Liberated Her, Then Her Job Moved ... by closeparen on Saturday October 14, 2017 @05:27PM (#15474404)
Which is a little ironic, given how much of the large global conflict in history has been fought over access to markets.

Independence in case of war is a good reason for governments to "overpay" domestic suppliers for defense contracts. It doesn't require them to isolate the general public from trade in peacetime.