"PRODUCTION"??? Did you say "production"? It=B4s in its hidden abode, I presume. We are economists, Sir!. "Nous n'avons pas besoin de cette hypothese". Of course, textbooks go on about Vinerian curves and Marshallian empty boxes, sometimes providing estimates of minimum efficient scales as percentage of the industry, etc.. But production is not subjectivist enough. Moreover, in the model just assume a convex set. [Non-convexity was introduced by Arrow & Hahn in their 1971 text with the Miltonian quote "A gulf profound as that Serbonian bog, Betwixt Damiata and Mount Cassius old, Where armies whole have sunk"]. In the unwieldy tome "Microeconomic theory" by MSG - the standard and technically superlative postgraduate textbook - the word "labor" does not appear in the index. [It should have appeared between "Kuhn-Tucker conditions" and "Lagrange multipliers"]. My favourite though, is J Trout Rader's article in the New Palgrave: "Production as Indirect Exchange". As for Georgescu-Roegen, I think that the majority of postgrads think that he is the guy who invented X-rays. Nicholas J. Theocarakis