I think that, the theory of demand and supply is an organizing principle to explain prices and quantities of goods sold changes thereof in a market . In microeconomics theory, it refers to price and output determination in a perfectly competitive market. This has served as a building block for modeling other market structures and for other theoretical approaches.
For a given of a commodity, demand shows the quantity all prospective buyers be to purchase at each the of the good. Demand is often represented using a table or a graph relating price and quantity demanded . Demand theory describes individual consumers as rationally choosing the most preferred quantity of each good, given income, prices, tastes, etc. A term for this is 'constrained utility maximization' (with income as the constraint on demand). Here, utility refers to the (hypothesized) preference relation for individual consumers. Utility and income are then used to model hypothesized properties about the effect of a price on the quantity demanded.
The law of demand states that, in general, price and quantity demanded in a given market are related. In other words, the higher the price of a product, the less of it people would be able and willing to buy of it (other things unchanged). As price of a commodity rises, overall purchasing power decreases (the income effect) and consumers move relatively less expensive goods (the substitution effect). Other factor can also affect demand; for example an increase in income will shift the demand curve outward relative to the origin.Demand is also affected by change in season, fashion, festival,consumers thought etc.
Supply is the relation between the price of a good and the quantity for sale from suppliers (such as producers) at that price. Supply is often represented using a table or graph relating price and quantity supplied. Producers are hypothesized to be profit-maximizes, meaning that they attempt to produce the amount of goods that will bring them the highest profit. Supply is typically represented as a directly proportional relation between price and quantity supplied (other things unchanged).
In other words, the higher the price at which the good can be sold, the more of it producers will supply. The higher price makes it profitable to increase production. At a price above equilibrium, there is a shortage of quantity supplied compared to quantity demanded. This pulls the price up. At a price above equilibrium, there is a surplus of quantity supplied compared to quantity demanded. This pushes the price down. The model of supply and demand predicts that for given supply and demand curves, price and quantity will stabilize at the price that makes quantity supplied equal to quantity demanded. This is at the intersection of the two curves in the graph above, market equilibrium.
For a given quantity of a good, the price point on the demand curve indicates the value, or marginal utility to consumers for that unit of output. It measures what the consumer would be prepared to pay for the corresponding unit of the good. The price point on the supply curve measures marginal cost, the increase in total cost to the supplier for the corresponding unit of the good. The price in equilibrium is determined by supply and demand. In a perfectly competitive market, supply and demand equate cost and value at equilibrium.
Demand and supply can also be used to model the distribution of income to the factors of production, including labor and capital, through factor markets. In a labor market for example, the quantity of labor employed and the price of labor (the wage rate) are modeled as set by the demand for labor (from business firms etc. for production) and supply of labor (from workers).
Demand and supply are used to explain the behavior of perfectly competitive markets, but their usefulness as a standard of performance extends to any type of market. Demand and supply can also be generalized to explain variables applying to the whole economy, for example, quantity of total output and the general price level, studied in macroeconomics.
In supply-and-demand analysis, the price of a good coordinates production and consumption quantities. Price and quantity have been described as the most directly observable characteristics of a good produced for the market. Supply, demand, and market equilibrium are theoretical constructs linking price and quantity. But tracing the effects of factors predicted to change supply and demand—and through them, price and quantity—is a standard exercise in applied microeconomics and macroeconomics. Economic theory can specify under what circumstances price serves as an efficient communication device to regulate quantity. A real-world application might attempt to measure how much variables that increase supply or demand change price and quantity.
Marginalism is the use of marginal concepts within economics. Marginal concepts are associated with a specific change in the quantity used of a good or of a service, as opposed to some notion of the over-all significance of that class of good or service, or of some total quantity thereof. The central concept of marginalism proper is that of marginal utility, but marginalists following the lead of Alfred Marshall were further heavily dependent upon the concept of marginal physical productivity in their explanation of cost; and the neoclassical tradition that emerged from British marginalism generally abandoned the concept of utility and gave marginal rates of substitution a more fundamental rôle in analysis.
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