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Sometimes it is difficult to find the margin because people value things so differently. And, yes, I know, the marginal value is found in the last one bought. I think the liquidity of the market determines how easy it is to find the marginal value of the last bought good.
You're right, because there's also the marginal unit of the next one to be sold (and we don't know what that one will be sold for).
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BTW, I found the post where you and the Mises guy were going at it and cross posted this article there. I think he probably had some inkling of this being published and front-ran it.
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