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The comparison isn't perfect, but it is relevant if you only consider the old guys at the gym who would play basketball at the highest level available to them and leave out those who are doing it purely recreationally.
On the margin, basketball players (those who are willing to play for compensation) have to pay to play, because there is such a glut on the market. The marginal teacher, on the other hand, gets paid to teach, because there is a shortage on the market.
There's a whole, much longer, discussion about why heterogeneity of labor makes all of these discussions very flawed.
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.
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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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