00:01
So here we have a whole bunch of propositions about perfect competition.
00:03
The first one is that price is equal to the minimum of the long run average cost.
00:10
This one is true, right? this one is true.
00:15
Otherwise, if this didn't hold, you would get entry, exit, right? if profits are positive, people come in.
00:23
If profits are negative, people leave.
00:25
Neither of those is a long -term equilibrium, right? b, profit is equal to zero.
00:33
This is, of course, true as well, right? right? for the same reason.
00:38
If profit wasn't zero, you'd have entry or exit, and when firms are actively entering or exiting, then you're not in long run equilibrium.
00:50
C is a little bit tricky...