To remove rational or logical thinking from something; or to end a system of government rations.
From 'de-' (remove) + 'rationalize' (make rational, or establish rationing). Primarily used in historical contexts about ending ration systems, though it can theoretically mean to remove rationality.
When governments 'derationalized' food systems after WWII, they had to trust markets again instead of carefully controlling everything—it was both a return to freedom and a leap of faith in human nature.
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