It occurs to me that I don't actually know what the labor theory of value is.

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See the first heading [here](https://www.econlib.org/library/Enc/Marxism.html). The "[marginal revolution](https://www.econlib.org/library/Enc/Marginalism.html)" brought the decisive end to this theory, though it had already been successfully de-bunked even before Adam Smith mysteriously revived it.

It can be refuted fairly easily: if value (i.e., price) is determined by labor, why does an unworked tract of land have a price at all? Further, why is the price of ice water higher in the Sahara than in the Arctic? Price is, instead, determined by supply and demand--and each of those is determined subjectively and at the margin.