00:05
So this individual is achieving consumer equilibrium.
00:11
This means marginal utility of pretzels over the price of pretzels is equal to marginal utility of coke over the price of coke.
00:21
The price of coke increases so this number goes up.
00:28
So therefore c is correct because this will decrease relative to this quantity.
00:41
So for this one we're given marginal utility of the lipstick or price of lipstick is equal to marginal utility of eyeshadow over the price of the eyeshadow.
01:02
So we have 24 over 4 is equal to 40 over 5.
01:22
So we want these two to be equal.
01:26
So we'll find a common denominator.
01:30
So multiply top and bottom by 5 on the left and multiply top and bottom by 4 on the right.
01:51
So for these to be equal we have to take into consideration that we're dealing with marginal utility.
02:07
So marginal utility should go down the more that we consume.
02:15
So we want our marginal utility for the lipstick to go up and marginal utility for eyeshadow to go down.
02:25
So we should consume more eyeshadow and less lipstick.
02:52
Jack received 30 utils from one apple, 40 from two, 55 from three...