00:01
So here we have a market, right, that we need to analyze.
00:03
A market, as always, is a relationship between quantity and price.
00:08
And we've got a whole bunch of lines here, right? we have a marginal private cost.
00:13
We have a marginal social cost.
00:17
We have a demand curve.
00:20
And we have a marginal revenue curve.
00:23
So let's answer each of these things.
00:26
A, this is a negative externality, right? and it is a negative because it is adding costs, right? and adding costs is bad.
00:38
Something that costs more is an unpleasant surprise.
00:41
This is a negative externality because when you consider the externality, the cost of this action is becoming greater.
00:50
For b, optimum is always at the same place.
00:55
The optimum is at where the marginal benefit is equal to the marginal social cost or the social marginal benefit...