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In page Jean-Baptiste Say:

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The exact phrase "supply creates its own demand" was coined by John Maynard Keynes, who criticized it as in the former two, equating all four of these statements to mean the same thing. Some economists, including some advocates of Say's law who dispute this characterization as a misrepresentation,[1] have disputed his interpretation, claiming that Say's law can actually be summarized more accurately as "production precedes consumption" and that Say was claiming that in order to consume one must produce something of value so that one can trade this (either in the form of money or barter) in order to consume later.[citation needed]