Supply and demand: Difference between revisions
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The | The law of '''supply and demand''' is a fundamental law of [[economics]]. It can be stated as follows: | ||
*the quantity of a commodity that consumers are prepared to buy, rises when the price of that commodity falls (and vice versa); | *the quantity of a commodity that consumers are prepared to buy, rises when the price of that commodity falls (and vice versa); | ||
*the quantity of a commodity that suppliers are prepared to sell, rises when the price of that commodity rises (and vice versa); so that, | *the quantity of a commodity that suppliers are prepared to sell, rises when the price of that commodity rises (and vice versa); so that, | ||
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The eventual price at which the hypothetical bargaining settles down is referred to as the ''market clearing'' or ''equilibrium'' price. It is an equilibrium position, like a pendulum at rest, in that any departure from it generates a tendency to return to it (higher prices result in unsold surpluses, prompting suppliers to reduce their prices and vice versa). | The eventual price at which the hypothetical bargaining settles down is referred to as the ''market clearing'' or ''equilibrium'' price. It is an equilibrium position, like a pendulum at rest, in that any departure from it generates a tendency to return to it (higher prices result in unsold surpluses, prompting suppliers to reduce their prices and vice versa). | ||
This is among the most familiar of all economic concepts; so much so that one might be tempted to regard it as a statement of the obvious, but its dissemination by the British economist Alfred Marshal in 1891 <ref> Alfred Marshall The Principles of Economics Chapter 3, Phoenix Books 1997 (1st edition 1891) </ref> introduced a major departure in economic theory. Previous economists, from Adam Smith to Karl Marx, had taught that prices were determined by the cost of production. (See | This is among the most familiar of all economic concepts; so much so that one might be tempted to regard it as a statement of the obvious, but its dissemination by the British economist Alfred Marshal in 1891 <ref> Alfred Marshall The Principles of Economics Chapter 3, Phoenix Books 1997 (1st edition 1891) </ref> introduced a major departure in economic theory. Previous economists, from Adam Smith to Karl Marx, had taught that prices were determined by the cost of production. (See [[history of economic thought]]). | ||
In his further exploration of the concept, Marshall introduced some further concepts that have since been widely used by economists. | In his further exploration of the concept, Marshall introduced some further concepts that have since been widely used by economists. | ||
*''Consumer's surplus'' denotes the amount by which consumers value a commodity over above what they have to pay for it. | *'''Consumer's surplus''' denotes the amount by which consumers value a commodity over above what they have to pay for it. | ||
*The ''income effect'' denotes the fact that the demand for most products increases as consumers' income increases. | *The '''income effect''' denotes the fact that the demand for most products increases as consumers' income increases. | ||
*The ''substitution effect'' denotes the fact that the demand for a commodity is influenced by the price of close substitutes. | *The '''substitution effect''' denotes the fact that the demand for a commodity is influenced by the price of close substitutes. | ||
*''Elasticity'' denotes the | *'''Elasticity''' denotes the change in demand in response to changes of price, income or the prices of substitutes. | ||
The use of the concepts of supply and demand in economic theory is further explained in the article on [[microeconomics]]. | The use of the concepts of supply and demand in economic theory is further explained in the article on [[microeconomics]]. | ||
Revision as of 15:02, 24 October 2007
The law of supply and demand is a fundamental law of economics. It can be stated as follows:
- the quantity of a commodity that consumers are prepared to buy, rises when the price of that commodity falls (and vice versa);
- the quantity of a commodity that suppliers are prepared to sell, rises when the price of that commodity rises (and vice versa); so that,
- the price at which transactions eventually take place is that at which the quantity that consumers are prepared to buy is the same as the quantity that suppliers are prepared to sell.
The eventual price at which the hypothetical bargaining settles down is referred to as the market clearing or equilibrium price. It is an equilibrium position, like a pendulum at rest, in that any departure from it generates a tendency to return to it (higher prices result in unsold surpluses, prompting suppliers to reduce their prices and vice versa).
This is among the most familiar of all economic concepts; so much so that one might be tempted to regard it as a statement of the obvious, but its dissemination by the British economist Alfred Marshal in 1891 [1] introduced a major departure in economic theory. Previous economists, from Adam Smith to Karl Marx, had taught that prices were determined by the cost of production. (See history of economic thought).
In his further exploration of the concept, Marshall introduced some further concepts that have since been widely used by economists.
- Consumer's surplus denotes the amount by which consumers value a commodity over above what they have to pay for it.
- The income effect denotes the fact that the demand for most products increases as consumers' income increases.
- The substitution effect denotes the fact that the demand for a commodity is influenced by the price of close substitutes.
- Elasticity denotes the change in demand in response to changes of price, income or the prices of substitutes.
The use of the concepts of supply and demand in economic theory is further explained in the article on microeconomics.
References
- ↑ Alfred Marshall The Principles of Economics Chapter 3, Phoenix Books 1997 (1st edition 1891)