This is particularly for Alejandro, Allin and Paul C: Re-browsing through the work by Porter referred to in another post, I note that Frances Ysidro Edgeworth appears to have been a pioneer in the use of the gas statistics metaphor for the operation of a competitive market economy (Porter, T. M. (1986). The rise of statistical thinking 1820-1900, Princeton: Princeton University Press, page 258). I'll follow-up the reference given there and report, but it looks to me as if FYE got the metaphor wrong: he seems to have associated the gas pressure with the (alleged) uniformity of price generated by competition. Julian
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