Knowledge is irreversible—i.e., in economic parlance, it doesn’t depreciate due to its substrate-independence, thus it compounds.

“The distinguishing feature of “technological idea” is that, once learned, it generally does not have to be learned again. It can be noted and remembered. Remembered, it no longer has to be produced; it remains with the actor as an unlimited factor of production that never wears out or needs to be economized by human action. It becomes a general condition of human welfare in the same way as air.”

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