<p>The monopolist will restrict output to be able to charge a higher price.</p>

<p>It is true that if the monopolist reduced the price, it could sell more units, but the benefit of selling more units is more than offset by the fact that the monopolist would have to charge a lower price on <em>all</em> units that were previously sold at a higher price.</p>

<p>Profits are maximised when marginal revenue (MR) equals marginal cost (MC). Producing in a region where marginal revenue is lower than marginal cost lowers profits.</p>

<p><a href="https://i.sstatic.net/zhY17.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/zhY17.png" alt="enter image description here"></a></p>

<p>In the case of perfect competition, the firm can sell any quantity at the market price, so <strong>marginal revenue equals the price (MR = P)</strong>. It will choose to sell a quantity where marginal revenue equals marginal cost (MR = MC). From these two equations we have MR = MC = P.</p>

<p><a href="https://i.sstatic.net/BZLM9.gif" rel="nofollow noreferrer"><img src="https://i.sstatic.net/BZLM9.gif" alt="enter image description here"></a></p>

<p><em>For the monopolist, marginal revenue is lower than price (MR &lt; P).</em> This is the crucial point. When the monopolist sells an extra unit of output, it earns price, BUT it also loses some money as <em>it has to lower the price on all units previously sold at a higher price</em>. This is why the monopolists marginal revenue at every quantity on the chart below is lower than the price. This is why on the chart below the marginal revenue curve lies below the demand curve.</p>

<p><a href="https://i.sstatic.net/IGkjT.gif" rel="nofollow noreferrer"><img src="https://i.sstatic.net/IGkjT.gif" alt="enter image description here"></a></p>

<p>The monopolist will choose to sell quantity Q* corresponding to Point A, where MR = MC &lt; P. <strong>This quantity is lower than the quantity were price equals marginal revenue</strong> (where the D curve intersects the MC curve above), which is the quantity chosen in perfect competition. So the quantity sold by the monopolist is lower than the quantity sold in perfect competition.</p>

<p>This is why a monopoly is undesirable from the consumer's perspective. Look at the chart above to the right of Point B. There are people (represented by the D curve) who are willing to pay a higher price for an extra unit of output than the marginal cost. Still, the monopolist will not produce that extra unit.</p>

CC BY-SA 3.0
2017-08-26T07:23:44.383Z
2017-08-26T08:45:36.823Z
2017-08-26T08:45:36.823Z
M3RS
<p>Why do markets that are dominated by a single seller have a tendency to maximize profits at lower levels of output than their competitive counterpart? Why is the competitive market equilibrium price lower than the monopolist price? </p>

CC BY-SA 3.0
2017-08-26T19:35:51.697Z
We expect to see some evidence of effort, eg how have you tried to answer the question and what is your particular difficulty.  If this is homework, please see the site guidelines on homework questions (https://economics.meta.stackexchange.com/questions/1465/economics-se-policy-on-homework-questions).
Adam Bailey
CC BY-SA 3.0
2017-08-26T23:00:10.007Z
My apologies. I will keep that in mind for next time.
david
<competition><monopolistic-competition>
Monopoly and competitive output levels
david
# Monopoly and competitive output levels

(Asked by: username_0 on 2017-08-26)

Why do markets that are dominated by a single seller have a tendency to maximize profits at lower levels of output than their competitive counterpart? Why is the competitive market equilibrium price lower than the monopolist price?

**Tags:** competition, monopolistic-competition
> **Comments:**
> **username_1**: We expect to see some evidence of effort, eg how have you tried to answer the question and what is your particular difficulty.  If this is homework, please see the site guidelines on homework questions (https://economics.meta.stackexchange.com/questions/1465/economics-se-policy-on-homework-questions).  
> **username_0**: My apologies. I will keep that in mind for next time.  

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## 1 answers

### Answer by username_2 on 2017-08-26. Score: 1

The monopolist will restrict output to be able to charge a higher price.

It is true that if the monopolist reduced the price, it could sell more units, but the benefit of selling more units is more than offset by the fact that the monopolist would have to charge a lower price on *all* units that were previously sold at a higher price.

Profits are maximised when marginal revenue (MR) equals marginal cost (MC). Producing in a region where marginal revenue is lower than marginal cost lowers profits.

[![enter image description here](https://i.sstatic.net/zhY17.png)](https://i.sstatic.net/zhY17.png)

In the case of perfect competition, the firm can sell any quantity at the market price, so **marginal revenue equals the price (MR = P)**. It will choose to sell a quantity where marginal revenue equals marginal cost (MR = MC). From these two equations we have MR = MC = P.

[![enter image description here](https://i.sstatic.net/BZLM9.gif)](https://i.sstatic.net/BZLM9.gif)

*For the monopolist, marginal revenue is lower than price (MR < P).* This is the crucial point. When the monopolist sells an extra unit of output, it earns price, BUT it also loses some money as *it has to lower the price on all units previously sold at a higher price*. This is why the monopolists marginal revenue at every quantity on the chart below is lower than the price. This is why on the chart below the marginal revenue curve lies below the demand curve.

[![enter image description here](https://i.sstatic.net/IGkjT.gif)](https://i.sstatic.net/IGkjT.gif)

The monopolist will choose to sell quantity Q\* corresponding to Point A, where MR = MC < P. **This quantity is lower than the quantity were price equals marginal revenue** (where the D curve intersects the MC curve above), which is the quantity chosen in perfect competition. So the quantity sold by the monopolist is lower than the quantity sold in perfect competition.

This is why a monopoly is undesirable from the consumer's perspective. Look at the chart above to the right of Point B. There are people (represented by the D curve) who are willing to pay a higher price for an extra unit of output than the marginal cost. Still, the monopolist will not produce that extra unit.


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