<p>I just need to make sense out of elasticities and how to determine if a good is normal or inferior.</p>
<p>I have determined by <span class="math-container">$X_1$</span> which is in the form <span class="math-container">$m/p_1 - p_1/p_2$</span>, that I should just take the derivative with respect to <span class="math-container">$m$</span> to get a value, which is always negative, and by that logic a normal good. But what does it mean when the demand of a good doesn't have <span class="math-container">$m$</span> in its function?</p>

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2020-10-21T20:33:01.243Z
Please consider using [MathJax](https://math.meta.stackexchange.com/questions/5020/mathjax-basic-tutorial-and-quick-reference) to format mathematical expressions. Also, at the very least, please do fix the typos in your post.
Herr K.
<microeconomics><mathematical-economics>
How can I know whether a good is inferior or normal? I can't determine elasticity with this?
Kristoffer Olsen
# How can I know whether a good is inferior or normal? I can't determine elasticity with this?

(Asked by: username_0 on 2020-10-21)

I just need to make sense out of elasticities and how to determine if a good is normal or inferior.

I have determined by $X\_1$ which is in the form $m/p\_1 - p\_1/p\_2$, that I should just take the derivative with respect to $m$ to get a value, which is always negative, and by that logic a normal good. But what does it mean when the demand of a good doesn't have $m$ in its function?

**Tags:** microeconomics, mathematical-economics
> **Comments:**
> **username_1**: Please consider using [MathJax](https://math.meta.stackexchange.com/questions/5020/mathjax-basic-tutorial-and-quick-reference) to format mathematical expressions. Also, at the very least, please do fix the typos in your post.  

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