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"The data necessary for centralized decision-making is not available at all."

— Steven Hayward, summarizing a point by F.A. Hayek

The meatier version, with context:
"Hayek was emphatic that no matter how big and how fast our computing power got, it did not change the fundamental defect of all centralized economic control: the problem is not simply mastering or processing a large amount of raw data.  Information and circumstances change too quickly.  More fundamentally, the data necessary for centralized decision-making is not available at all."