(1) J. B. Say Explanation: "Supply creates its own demand" is the formulation of Say's law by John Maynard Keynes. The rejection of this doctrine is a central component of The General Theory of Employment, Interest and Money (1936) and a central tenet of Keynesian economics. Say's Law (or Say's Law of Markets), is often summarized as: "Aggregate supply creates its own aggregate demand", "Supply creates its own demand", "If you build it, they will come", and Inherent in supply is the wherewithal for its own consumption".