Say's law

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Say's Law

The concept that, because that which is consumed must be produced, supply creates its own demand. That is, supply of products will eventually be consumed by demand. This is an important concept for supply-side economics; Keynesianism, however, holds the opposite view.
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Say's law

the proposition that AGGREGATE SUPPLY creates its own AGGREGATE DEMAND. The very act of producing a given level of national output generates an amount of income (wages, profits, etc.) exactly equal to that output, which, if spent, is just sufficient to take up the purchases of the whole of the output that has been produced. It follows that, in order to reach the full-employment level at national output, all that needs to be done is to increase aggregate supply.

The key assumptions are that the economic system is ‘supply-led’ and that all income is spent. In practice, however, some income is leaked’ into saving, taxation, etc. (see CIRCULAR FLOW OF NATIONAL INCOME) and there is no automatic guarantee that all this income will be subsequently ‘injected’ back as spending. Thus, in contrast to the above proposition, the economic system is ‘demand-led’, a fall in aggregate demand leading to a multiple contraction of national income and output. See EQUILIBRIUM LEVEL OF NATIONAL INCOME.

Collins Dictionary of Economics, 4th ed. © C. Pass, B. Lowes, L. Davies 2005
References in periodicals archive ?
It is interesting to note that the basic law governing the field of economics, Say's Law, is essentially this same principle applied to the marketplace.
Topics include absolute income hypothesis, business cycle theory, demand management, inflation, multiplier effect, Say's Law, Ricardo Effect and more.
In Hazlitt's time, Keynes's program was still revolutionary and described by Hazlitt as a kind of "New Economics" that broke with the insights of classical economics and especially with Say's Law. Now, Keynesianism is mainstream.
Understanding the pre-Keynesian theory of the cycle, and especially Say's Law of markets, makes apparent the folly of the stimulus and makes clear why it could never have achieved its aims.
Patrick Krey's book review in the April 26 issue contains the following parenthetical remark: "After all, as we know, if the supply of something increases, the demand will drop." Krey's observation is not in conformity with Say's Law, which asserts that supply creates its own demand.
Abstract: A previously undocumented and unpublished letter from John Maynard Keynes to the American economist Harlan Linneus McCracken dated 31 August 1933, a letter only discovered in July 2007, should lead to a revision of our understanding of the sequence of events that led to the eventual focus of the General Theory on demand deficiency and Say's Law. These were the very issues dealt with at length by McCracken in his 1933 publication Value Theory and Business Cycles.
One example Coleman offers, anti-economists' rejection of Say's Law, reminds us that he does not consider John Maynard Keynes an anti-economist despite Keynes's rejection of nearly everything monetary economists had written.
Underlying all this is the fact that medicine is particularly vulnerable to perversions of Say's Law, which states that supply creates its own demand.
The meaning and the significance of Say's Law have spawned numerous controversies, and the issues at stake have shaped theoretical models and policy advice for generations of economists.
Given such cost flexibility, Say's Law of Markets remained in force in Japan.
The report states that two principal problems continue to weigh on real estate --even if bank stocks ignored them in the first quarter of 1992: first, the probability that real estate entered a down phase in 1989 after 50-year cycle, and second, the reversal of Say's Law, which states that supply creates its own demand.
Not since 1924 has there been a comprehensive yet readable book on economics aimed at the ordinary but intelligent citizen that defends and incorporates the field's foundational principle, Say's Law (named after Jean-Baptiste Say, 1767-1832) and its main corollaries: the primacy of production, the entrepreneur as prime mover, and prices as the commercial language that coordinates economies and their subsectors.