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At equilibrium, there is no competition either to buy or to sell, because everyone can buy or sell however much they may wish, at going price. But whenever market is away from equilibrium, competition will arise and tend to force it back.
Alfred Marshall (1842 - 1924) compared supply and demand sides to two blades of scissors One won't cut by itself. You have to have both!
One of key words in economics is "allocation." To allocate resources is to determine who gets use of what resources. An obvious case of allocation of resources is when market processes of bidding, buying and selling determines who gets use of what resources. That is, in effect, markets can allocate resources.
Accordingly, economics is centrally concerned with workings of markets, and with question, how do markets allocate resources? One answer to that question is expressed in familiar phrase, "Supply and Demand."
The allocation of resources through markets is a complex process. There are several models of resource allocation through markets, but model of "Supply and Demand" is best known and most widely used model!
Copyright © 2005 I.E.C. Haramis haramis@greekshares.com http://www.greekshares.com
Ioannis - Evangelos C. Haramis was born in Greece in 1951. Studied Business Administration, Marketing and Economics in Greece, USA and in Belgium.
He has been active in the stock markets since 1972. Since 2002 he is New Business Development Managing Director at an Investment Bank.