<blockquote>
<p>but this implies that somehow the quantity demanded is multiple values simultaneously at a single price point. How is this possible?</p>
</blockquote>
<p>This just says that at that particular price people will demand any amount of goods between <span class="math-container">$[0,\infty]$</span>.</p>
<p>There is no reason why the quantity demanded could not be multiple different numbers at a given price. That just means more than 1 quantity is consistent with price.</p>
<blockquote>
<p>For example, in this graph, the quantity demanded at 4 dollars is somehow 10, 20, 30, etc. units all at once.</p>
</blockquote>
<p>Yes, exactly. There is nothing wrong with that. That just says that at price 4 people could demand any number of goods. Of course only one combination will actually be realized in reality, but any quantity at that price is possible outcome.</p>
<p>Consider an analogy. A model for stock price could predict that stock price increase will be anything between 3-15%. Of course, eventually only 1 price change materializes but ex ante that one price change could be anything in the range. Similarly, with infinitely elastic demand at price equals 4 any quantity demanded will be consistent with demand but in real life only one quantity would materialize.</p>
<blockquote>
<p>Also, when demand is perfectly elastic, the quantity demanded supposedly rises to “infinity” when the price drops below the equilibrium price (in this case, 4 dollars), but why doesn’t it show that on the graph?</p>
</blockquote>
<p>It is shown in the graph, there is no way how you can graph an infinite line with finite piece of paper, but the fact that the line is not ended with some clearly marked point indicates that it goes on to infinity.</p>

CC BY-SA 4.0
2022-10-15T18:30:41.483Z
Oh ok so it’s more like a range?
Anthony Fallone
CC BY-SA 4.0
2022-10-15T18:41:59.070Z
@AnthonyFallone yes that’s also what the picture shows. Function where f(x) is fixed for a range is a straight line
1muflon1
CC BY-SA 4.0
2022-10-15T18:22:40.870Z
2022-10-15T18:22:40.870Z
1muflon1
<p>I know that perfectly elastic demand looks like a horizontal line on a graph, but this implies that somehow the quantity demanded is multiple values simultaneously at a single price point. How is this possible?</p>
<p><a href="https://i.sstatic.net/ExZCP.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/ExZCP.png" alt="enter image description here" /></a></p>
<p>For example, in this graph, the quantity demanded at 4 dollars is somehow 10, 20, 30, etc. units all at once. Also, when demand is perfectly elastic, the quantity demanded supposedly rises to “infinity” when the price drops below the equilibrium price (in this case, 4 dollars), but why doesn’t it show that on the graph? Instead, there are no points on the line that intersect at a price below 4 dollars. Can someone please explain this in a manner that’s comprehensible?</p>

<elasticity><demand>
Question regarding perfectly elastic demand
Anthony Fallone
# Question regarding perfectly elastic demand

(Asked by: username_0 on 2022-10-15)

I know that perfectly elastic demand looks like a horizontal line on a graph, but this implies that somehow the quantity demanded is multiple values simultaneously at a single price point. How is this possible?

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

For example, in this graph, the quantity demanded at 4 dollars is somehow 10, 20, 30, etc. units all at once. Also, when demand is perfectly elastic, the quantity demanded supposedly rises to “infinity” when the price drops below the equilibrium price (in this case, 4 dollars), but why doesn’t it show that on the graph? Instead, there are no points on the line that intersect at a price below 4 dollars. Can someone please explain this in a manner that’s comprehensible?

**Tags:** elasticity, demand

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## 1 answers

### Answer by username_1 on 2022-10-15. Score: 1

> but this implies that somehow the quantity demanded is multiple values simultaneously at a single price point. How is this possible?

This just says that at that particular price people will demand any amount of goods between $[0,\infty]$.

There is no reason why the quantity demanded could not be multiple different numbers at a given price. That just means more than 1 quantity is consistent with price.

> For example, in this graph, the quantity demanded at 4 dollars is somehow 10, 20, 30, etc. units all at once.

Yes, exactly. There is nothing wrong with that. That just says that at price 4 people could demand any number of goods. Of course only one combination will actually be realized in reality, but any quantity at that price is possible outcome.

Consider an analogy. A model for stock price could predict that stock price increase will be anything between 3-15%. Of course, eventually only 1 price change materializes but ex ante that one price change could be anything in the range. Similarly, with infinitely elastic demand at price equals 4 any quantity demanded will be consistent with demand but in real life only one quantity would materialize.

> Also, when demand is perfectly elastic, the quantity demanded supposedly rises to “infinity” when the price drops below the equilibrium price (in this case, 4 dollars), but why doesn’t it show that on the graph?

It is shown in the graph, there is no way how you can graph an infinite line with finite piece of paper, but the fact that the line is not ended with some clearly marked point indicates that it goes on to infinity.

> **Comments:**
> **username_0**: Oh ok so it’s more like a range?  
> **username_1**: @AnthonyFallone yes that’s also what the picture shows. Function where f(x) is fixed for a range is a straight line  

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