Maximizing u(x, y) with A and B constraints: Tips from Gekkoo

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Homework Help Overview

The discussion revolves around maximizing the function u(x, y) = x^α * y^β under the constraint Ax + By = m. Participants are exploring methods to approach this optimization problem.

Discussion Character

  • Exploratory, Mathematical reasoning, Problem interpretation

Approaches and Questions Raised

  • Participants discuss the method of Lagrange multipliers as a potential approach. Others suggest rewriting the constraint to express y in terms of x and substituting it into the objective function. There are inquiries about finding maxima and minima and deriving the first-order condition (FOC) for critical points.

Discussion Status

The discussion is active, with participants providing various methods and expressing challenges in deriving the first-order condition. There is no explicit consensus, but several lines of reasoning are being explored, including the use of Lagrange multipliers and substitution methods.

Contextual Notes

Participants are working under the constraints of the problem statement and are seeking clarification on the derivation of critical points and the second-order condition (SOC) for the objective function.

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Homework Statement



I need help to maximize the below function:

Homework Equations



Maximize u(x, y) = x^α * y^β subject to Ax + By = m

Any help is greatly appreciated!

/ Gekkoo
 
Last edited:
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I'm a big fan of "Lagrange Multipliers" but if you don't know that method, you could just write y= (m- Ax)/B so that [itex]x^\alpha*y^\beta= x^\alpha*(m-Ax)^\beta/B^\beta[/itex]. Now, do you know how to find maxima and minima for that?
 
Thanks for your answers.

1 Solve constraint for y:

y=(m-Ax)/B

2 Plug into objective function:

u=x^α*[(m-Ax)/B]^β

3 Diff w.r.t. x & equate to zero to get critical point:

FOC: x^α*ln(x)*?=0

4 Solve FOC for x:

x=?

5 Plug that into constraint to get value for y:

y = (m-A[?])/B

6 Than I have a candidate solution & need to check SOC of objective function w.r.t x!

But I fail to successfully derive FOC. Can anyone please help me out?
 

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