Barkley Rosser wrote:
> ----------------- HES POSTING -----------------
> Steve Kates,
>
> I guess you are correct that Keynes invented the phrase, "supply 
> creates its own demand."  Googling shows various folks
> attributing it to James Mill, but when one looks further for an actual 
> quote, they always come out somewhat longer and
> more complicated.


The oldest reference among the JSTOR journals to "supply creates its own 
demand" -- exactly that phrase, not some equivalent expression, is found 
in English in an article written by Davidson in Swedish, which I cannot 
read, but can see refers to Keynes: 

    *Nationalekonomien i st???psleven
    <[log in to unmask]&currentResult=02847310%2bap060254%2b06a00010%2b0%2c020020&config=&viewContent=citation" target="_blank">http://www.jstor.org/view/02847310/ap060254/06a00010/0?searchUrl=http%3a//www.jstor.org/search/BasicResults%3fhp%3d25%26so%3dOldestFirst%26si%3d1%26Query%3d%2522supply%2bcreates%2bits%2bown%2bdemand%2522&frame=noframe&dpi=3&[log in to unmask]&currentResult=02847310%2bap060254%2b06a00010%2b0%2c020020&config=&viewContent=citation>*


    David Davidson

    /Ekonomisk Tidskrift/, ???rg. 38, h???ft 5/6. (1936), pp. 103-124.

    Stable URL:
    http://links.jstor.org/sici?sici=0284-7310%281936%2938%3A5%2F6%3C103%3ANIS%3E2.0.CO%3B2-5

The oldest reference in JSTOR to Say's law is, however, much older and 
expresses the concept of supply creates its own demand clearly:

            *Methods of Teaching Elementary Economics at the University
            of Michigan
            <[log in to unmask]&currentResult=00223808%2bdi950521%2b95p00223%2b3%2c10&config=&viewContent=citation" target="_blank">http://www.jstor.org/view/00223808/di950521/95p00223/0?searchUrl=http%3a//www.jstor.org/search/AdvancedResults%3fhp%3d25%26so%3dOldestFirst%26si%3d1%26All%3d%2522Say%2527s%2blaw%2522%26Exact%3d%26One%3d%26None%3d%26sd%3d%26ed%3d%26jt%3d&frame=noframe&dpi=3&[log in to unmask]&currentResult=00223808%2bdi950521%2b95p00223%2b3%2c10&config=&viewContent=citation>*
            F. M. Taylor /The Journal of Political Economy/ , Vol. 17,
            No. 10. (Dec., 1909), pp. 688-703.
            Stable URL:
            http://links.jstor.org/sici?sici=0022-3808%28190912%2917%3A10%3C688%3AMOTEEA%3E2.0.CO%3B2-5



        Kevin Hoover