As you may know, Mungoites each have two left feet and one right foot. Their preferences for left and right shoes display perfect complementarity. Mungoites find shoes useful only in trios of two lefts and a right. The price of each type of shoe is $10 a shoe, and Mungoites consume nothing other than shoes. A Mungoite's Engel curve for right shoes has the equation
A) R =m/3.
B) R = m - 10.
C) R = 2m.
D) R = 10m.
E) R =m/10.

Question

Quizplus · Accepted Answer

The Engel curve for right shoes is derived from the fact that Mungoites need 2 left shoes for every right shoe. Therefore, for every trio of shoes (2 lefts and 1 right), they spend $30. Hence, the number of right shoes (R) they can buy is m/30, but since they need 1 right shoe for every $30 spent, the equation simplifies to R = m/3.

As You May Know, Mungoites Each Have Two Left Feet