# Oligopoly, Cournot's Oligopoly Model

__Meaning of Oligopoly__

Oligopoly is a market condition, in which there are a few selling standardised of diverse commodities. It is hard to point out the number of industries in the oligopolist market. There may be more than two industries. It is also known to be rivalry amongst the few. With only a few industries in the market, the performance of one industry is tending to affect the others.

An oligopoly firm manufactures products either a standardised product or assorted commodities. The former is called perfect oligopoly and the subsequent is called imperfect oligopoly.

__Cournot’s Oligopoly Model__

Cournot model of oligopoly is perchance the prime model which explains the mannerism of a single industry under stipulations of monopoly and perfect competition.

An illustration would explain the oligopolistic situation in the market.

__Illustration 2__

Presume the market demand curve of a product is V = 140 – A. Assume that there are more than two industries and we are considering two industries for comparison, each with invariable marginal cost MC of $20.

- Supposing they perform as Cournot oligopolists, determine the price and total firm productivity.

- Compare with the result under pure monopoly and perfect competition.

__Solution__

Market demand for output is V = MC

- ⇒ 140 – A = MC
- ⇒ 140 – A = 20
- ⇒ A = 140 – 20
- ⇒ A = 120

Let us assume the productivities of the two industries as A1 and A2 and that the total productivity would be A1 + A2 = A.

- ⇒A1 =
__120 – A2__………….Equation (1)
2

- ⇒ A2 =
__120 – A1__………….Equation (2)
2

- ⇒ A1 = 120 –
__[ 120 – A1]__

__2__

2 - ⇒A1 =
__120 – 60 + ½ A1__

2 - ⇒A1 = 60 – 30 + ¼ A1
- ⇒A1 – ¼ A1 = 30
- ⇒¾ A1 = 30
- ⇒A1 = 30 x 4/3
- ⇒A1 = 40

By substituting A1 as 40, we get A2 as 40 and thus we can derive the total productivity as A = A1 + A2 = 40 + 40 = 80

To determine the price, using the task, V = 140 – A, we get

V
(Value or Price) = 140 – (40+40) = 140 – 80

=
60

**Hence Price V = 60, Total Productivity A = (A1 + A2) = 80**

__Condition 2__

To compare with the results under monopoly and perfect competition, we have to compute as follows.

Marginal revenue under pure monopoly MR = Total Revenue / Total Quantity

And Total Revenue is Price x Quantity.

Here price is V and Quantity is A

While we substitute with Marginal Cost of $20, i.e. V = MC,

140 – (A1+A2) = 20

Let us assume A1 and A2 as 2A since this is pure monopoly and there cannot be two productivities. Now, in equilibrium productivity under monopoly MR = MC.

MR = 140 – 2A and MC is given as 20

140 – 2A = 20; 2A = 120

A = 60

**Price under pure monopoly, V = 140 – A = 140 – 60 = 80.**

__(ii) Output under perfect competition__

For equilibrium productivity under perfect competition

Price = MC

140 – A = 20; A = 120

**Price under perfect competition = 140 – 120 = 20.**

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