# Questions tagged [mwg]

This tag is for questions relating to the book "Microeconomic Theory" by Andreu Mas-Colell, Michael Whinston, Jerry Green

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### Why free disposal assumption needed in Prop 5.C.1 and 5.C.2 in MWG?

I'm a little confused as why we needs only the assumption of Y being closed and satisfies free disposal in the MWG prop 5.C.1 and 5.C.2. I think i know why Y needs to be closed but what about free ...
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### I need to prove how an increase in output p increases profit-max. Can someone help to understand why IFT implies that z is a unique maximizing point? [closed]

MWG 5C6 asks: "Suppose a concave prod function f(z) with inputs $(z_1,...,z_L-1)$ and also that $\partial f(z))/\partial z_l \geqslant 0$ for all l and $z\geqslant0$ and that $D^2f(z)$ is ...
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### Is it enough to prove that $x \not \succsim^* y$?

I'm trying to negate that: $\exists B \in \mathcal{B}$ such that $x,y \in B$ and $x \in C(B)$. Looks that the negation is equivalent to: $\forall B \in \mathcal{B}(x,y \in B \implies x \not \in C(B))$....
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### A question from MWG 2F12

This question is from MWG if walrasian demand function is generated by a rational preference relation then it must satisfy weak axiom. I cannot prove this statement. How can I do?Thanks alot.
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### Adverse Selection: Positive Selection of Worker Types (Mas-Collel)

I'm reviewing some question from Mas-Collel and I am stuck on a chapter 13 question related to adverse selection. Consider a model of positive selection in which there are workers of two possible ...
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### Best companion for Mas-Colell Microeconomic Theory textbook

What are the best sources to accompany MasColell Microeconomic Theory textbook in 1st year of MA in economics? I mean any sources - textbooks, videos, websites, book companions, etc. And I mean easy ...
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1 vote
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### What are the mathematical prerequisites to understand Whinston and Green's "Microeconomic Thoery"?

I've completed my under graduation in economics where I used micro books like Nicholson and Snyder's Microeconomic Theory and Hal Varian's Intermediate Microeconomics. I am comfortable with topics ...