00:01
So here we're thinking about attacks, and we're given a demand curve of 40 minus 4q.
00:06
We are also given a supply curve of 10 plus q, and i'm going to find equilibrium.
00:13
And to find equilibrium, i'm going to set the two of these things equal to each other, right? 40 minus 4q is equal to 10 plus q.
00:22
I arrange terms.
00:23
I get 30 is equal to 5q.
00:25
I get q is equal to 6, and this gives me a price of 16.
00:30
And if i plug it into either curve, i get 16.
00:34
So my baseline here is quantity and price.
00:40
Supply starts at 10 and slopes up.
00:43
Demand starts at 40 and slopes down and gives me this intersection here of a price of 16.
00:50
This is 40, this is 10, and a quantity of six.
00:54
Wonderful.
00:55
Now we are excising a $10 excise tax.
00:58
So what i want to do is shift the demand curve down by 10, right? i'm thinking about demand minus tax, which is equal to demand minus 10, right? if you have to pay the government $10 to buy the thing, you're willing to pay the firm $10 less...