<p>Agree with the answer by Kenny, I'd just also add that if you take a look at the horizontal axis, the curve shifts left by <span class="math-container">$n(q_1 - q_2)$</span> units, while the firm's quantity decreases by <span class="math-container">$q_1 - q_2$</span>. So, in the quantity dimension, you do get that expected factor of <span class="math-container">$n$</span> when you look at the horizontal difference in the market vs. the firm.</p>

CC BY-SA 4.0
2020-12-23T05:44:42.933Z
2020-12-23T05:44:42.933Z
Amaan M
<p>PFA the image below. </p>

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

<p>As there are n firms in the market, and a tax of t moves up the cost curves of an individual firm by t units, shouldn't the cost curve of the market move up by n*t units? If yes, why does the book move the curves up only by t units. If no, could you please explain where my reasoning is going wrong?</p>

<p>Thanks</p>

<supply-and-demand>
Getting a market supply curve from firm supply curve
Aamir Khan
# Getting a market supply curve from firm supply curve

(Asked by: username_0 on 2019-03-16)

PFA the image below.

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

As there are n firms in the market, and a tax of t moves up the cost curves of an individual firm by t units, shouldn't the cost curve of the market move up by n\*t units? If yes, why does the book move the curves up only by t units. If no, could you please explain where my reasoning is going wrong?

Thanks

**Tags:** supply-and-demand


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## 1 answers

### Answer by username_1 on 2020-12-23. Score: 0

Agree with the answer by Kenny, I'd just also add that if you take a look at the horizontal axis, the curve shifts left by $n(q\_1 - q\_2)$ units, while the firm's quantity decreases by $q\_1 - q\_2$. So, in the quantity dimension, you do get that expected factor of $n$ when you look at the horizontal difference in the market vs. the firm.


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