
Perfectly Competitive Market Equilibrium
A perfectly competitive market is one in which the number of buyers and sellers is very large, all engaged in buying and selling a standardised product without any artificial restrictions and possessing perfect knowledge of market at a time.
There are two parties
which bargain in such a market the buyers and sellers. It is only when they agree a
commodity can be purchased and sold at a certain price. Thus product pricing is influenced
both by buyers and sellers that is demand and supply.
The law of demand
is applicable to buyers. As per this, when price hikes, demand drops and vice versa.
The law off supply applies on the supply side. The law states that supply increases
with the hike in price. Thus demand supply is the two counteracting forces which move
in the opposite directions. Price is determined at a point where these two forces are
equal and that is known as the equilibrium price. Quantity demanded and supplied at
this price is called Equilibrium quantity. When price is less or more than the
equilibrium price, there is disturbance in the equilibrium output. But ultimately equilibrium
price will prevail.
Let us see an illustration which explain pricing process clearly
Illustration
Price in $ |
Quantity Demanded |
Quantity Supplied |
20 |
240 |
40 |
40 |
200 |
60 |
60 |
160 |
90 |
80 |
120 |
120 |
100 |
80 |
160 |
120 |
40 |
240 |
The above tablet gives various prices under volume demand and supply. Construct a graph where the demand and supply intersects each other and show the points of price variations where there is excess demand and supply.
Solution
Equilibrium Determination
- When the price of a product is $ 20, 240 units are demanded whereas only 40 units are supplied. This show with the decrease in price demand is hiking and supply is dropping.
- Likewise, when the price is $120, the demand drops to 40 units and supply to 240 units.
- Hence the point of price at equilibrium is $80, where both demand and supply intersects. Hence the equilibrium demand and supply is 120 units each.
Point where Excess demand occurs
- Once we derive the equilibrium price, there is no likeliness for it to change. Hence in any time if price becomes lower to $80, the influences of demand and supply will bring it back to $80.
- For instance, if the price drops from $80 to 60, the demand hikes to 160 units and supply reduces to 90 units. Hence the price at which the excess demand starts is at price $60 and excess demand lasts till the price goes further below that is $20.
Point where Excess supply occurs
- Less supply of product in relation to increasing demand for them will hike price to $80.
- Consequently, the demand will drop to 120 units and supply will also hike to 120 units. Thus equilibrium price is re-established.
- Alternatively, with the price hikes to $100, demand drops to 80 units and supply hikes to 160 units and lasts till the price is high that is $120. Hence excess supply starts at 160 units.
Now let us construct a graph representing the conditions, excess demand, excess supply and the price point where these occur.

Solution: Excess demand occurs at price $60, Excess supply occurs at price $100 and Equilibrium occurs at price $80.
Further there is a very significant point to be noted. When every seller tries to sell
his product, he has to lower his price a little and others too follow him until the
price comes down to $80 and the equilibrium amidst demand and supply is re-established.
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- Applications of Demand and Supply Analysis under Perfect Competition
- Concepts of Revenue
- Derived Demand, Joint Supply
- Determination of Profit Maximisation under monopolist situation
- Duopoly and Oligopoly
- Equilibrium of the Firm and Industry
- Forms of Market Structure
- Importance of Time Element in Price Theory
- Joint Demand Supply
- Linear Programming
- Long Run Equilibrium of Firm and Industry
- Market Structures
- Monopolistic Competition
- Monopsony and Bilateral Monopoly, Price output Determination
- Objectives of Business Firm
- Oligopoly, Cournot's Oligopoly Model
- Pricing of Public Undertakings
- Profit Maximisation, Full cost, Pricing and Sales Maximisation
- Profit Price Policy
- Resource allocation under monopoly
- Short, Long Run Supply Curve of the Firm and Industry
- Similarities and Dissimilarities between Monopoly Competition and Perfect Competition
- Supply Its Law - Elasticity and Curve
- The Nature of Costs and Cost Curves
- Williamson's Utility Maximisation