Answer to Question #187895 in Microeconomics for DALHAT MAITAMA GAR

Question #187895

The consumer utility function for mango tree and orange tree is given U=q1q2, the price for mango tree is $40.00 and orange is $20.00. The consumer income for the period is $120.00. Determine the quantities of mango tree and orange tree which should be purchased in order to maximize derived utility?.


1
Expert's answer
2021-05-03T10:54:50-0400

Solution:

The optimal consumption bundle is one where the slope of the indifference curve MUq1MUq2\frac{MUq1}{MUq2} is equal to the slope of the budget line.


Derive MRSq1q2 = MUq1MUq2\frac{MUq1}{MUq2}

MUq1 = ​Uq1\frac{∂U}{∂q1} = q2


MUq2 = ​Uq2\frac{∂U}{∂q2} = q1


MRSq1q2 = q2q1\frac{q_{2} }{q_{1} }


MRSq1q2 = Pq1Pq2\frac{Pq1}{Pq2}


q2q1\frac{q_{2} }{q_{1} } = 4020\frac{40 }{20 }

q2 = 2q1

Derive utility function:

M = Pq1q1+ Pq2q2

120 = 40q1 + 20q2

Therefore:

120 = 40q1 + 20(2q1)

120 = 40q1 + 40q1

120 = 80q1

q1 = 12080\frac{120}{80 } = 1.5


q1 = 1.5

Plug this figure into the q2 function:

q2 = 2q1

q2 = 2(1.5)

q2 = 3

Maximizing Utility (1.5, 3)

The quantities of the mango tree to be purchased to maximize derived utility = 1.5

The quantities of the orange tree to be purchased to maximize derived utility = 3

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