00:01
We have charlie's utility function.
00:13
He has 40 apples and 50 bananas.
00:24
We need to find his utility for the given bundle.
00:27
So it's going to be 40 times 5.
00:39
So we get 200.
00:48
The indifference curve through 45 includes all bundles such that xa times xb is equal to 200.
00:59
So the indifference curve through this has the equation xb is equal to xa times xb is equal to 200.
01:13
Xb is equal to 200 divided by xa.
01:27
Donna offers to give charlie 15 bananas if he will give her 25 apples.
01:33
Charlie has a bundle that he likes better if he makes this trade.
01:46
So he originally had 40 apples and he is going to trade away 25.
01:55
So now he has 15 apples left.
02:01
And then from this trade he is going to get 15 bananas.
02:05
So we have 5 plus 15.
02:08
We have 20 bananas.
02:18
So then from the utility function we get 300.
02:34
So the utility is greater than the utility he got with the bundle he had previously...