Question

Suppose Joe is maximizing total utility within his budget constraint. If the price of the last pair of jeans purchased is $25 and it yields 100 units of extra satisfaction and the price of the last shirt purchased is $20, then, using the rule of equal marginal utility per dollar spent, the extra satisfaction received from the last shirt must be:

A) 2,000 units of utility.
B) 500 units of utility.
C) 100 units of utility.
D) 80 units of utility.

Answer 1

80 units

Step-by-step explanation:

Given:

• Price: $25 we have: 100 units
• Price: $20, how many units to maximize the total utility

Let X is the number of units we need to find

As we know that, the law of equal-marginal utility a consumer spends his or her income among goods so that utilities receive from the amount spent is equal. So we use a simple rule of three:

$25 100 units of utility

$20 X

<=> 25X = 20*100

<=> X = 80 units

Hope it will find you well.