<p>We also know that for a competitive market, the supply curve is the sum of the marginal cost curves. </p>

<p>Can one make an extension of this idea to having the demand curve being equal to the sum of marginal revenue curves with its slope coefficient doubled? </p>

CC BY-SA 3.0
2018-04-25T09:42:35.200Z
Are you assuming linear demand or not?
Giskard
CC BY-SA 3.0
2018-04-25T09:43:51.613Z
P.s.: This can be seen as nitpicking but the supply curve is not the sum  marginal cost curves. Supply is a function of price and marginal cost is a function of quantity.
Giskard
CC BY-SA 3.0
2018-04-25T16:14:43.260Z
@denesp I guess I am assuming linear demand now that you mention it. Can you give me a source for the claim "Supply is a function of price and marginal cost is a function of quantity." as I'm currently of the impression that it doesn't matter given the basic supply and demand framework.
EconJohn
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2018-04-25T16:55:51.630Z
Will [Wikipedia](https://en.wikipedia.org/wiki/Supply_(economics)) do? "Supply is often plotted graphically with the quantity provided (**the dependent variable**) plotted horizontally and the price (**the independent variable**) plotted vertically." (Emphasis by me.)
Giskard
<microeconomics>
Using aggregate marginal revenue as a way to estimate demand
EconJohn
# Using aggregate marginal revenue as a way to estimate demand

(Asked by: username_0 on 2018-04-24)

We also know that for a competitive market, the supply curve is the sum of the marginal cost curves.

Can one make an extension of this idea to having the demand curve being equal to the sum of marginal revenue curves with its slope coefficient doubled?

**Tags:** microeconomics

> **Comments:**
> **username_1**: Are you assuming linear demand or not?  
> **username_1**: P.s.: This can be seen as nitpicking but the supply curve is not the sum  marginal cost curves. Supply is a function of price and marginal cost is a function of quantity.  
> **username_0**: @denesp I guess I am assuming linear demand now that you mention it. Can you give me a source for the claim "Supply is a function of price and marginal cost is a function of quantity." as I'm currently of the impression that it doesn't matter given the basic supply and demand framework.  
> **username_1**: Will [Wikipedia](https://en.wikipedia.org/wiki/Supply_(economics)) do? "Supply is often plotted graphically with the quantity provided (**the dependent variable**) plotted horizontally and the price (**the independent variable**) plotted vertically." (Emphasis by me.)  

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## 0 answers

