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Website title: Environmental and Urban Economics

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 Many decades ago Frank Knight stated the point of this Substack as he sketched out the knowledge problem.


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Matthew E. Kahn and GeminiOctober 5, 2026.In standard intermediate microeconomics, a profit-maximizing firm uses an input until marginal revenue product equals marginal factor cost. For a perfectly competitive firm, the output price p is exogenous, so this condition equates the marginal value product of the input to its factor price.Applying that logic to firm demand for...

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 On October 13th 2026,  I will have the opportunity to debate a future Nobel Prize Winner (my friend Emmanuel Saez).


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Here are some of my new published papers.   

Articles Emma Harrington & Matthew E. Kahn, 2026. "Can Remote Work Narrow Gender Gaps in Greedy Jobs?," 

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For those looking for a Halloween Gift to share with children in late October, consider giving them a free copy of my new 547 page book.



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