00:01
So here we're talking about a market for shrimp.
00:03
And the first thing we want to do in a is draw an equilibrium diagram, right? equilibrium is quantity and price.
00:10
Again, i can't embed these for you, but hopefully you can copy them if you're so inclined.
00:15
Even better to reproduce them yourself, right, by hand.
00:18
So there's an equilibrium.
00:19
The intersection of demand and supply generates an equilibrium price and an equilibrium quantity.
00:26
Right? now we're going to think about the shrimp farmer.
00:30
The shrimp farmer is producing a certain amount of quantity, and we need to talk about their average total cost.
00:37
So the key thing is that the market is perfectly competitive.
00:40
So this is the price that the farmer faces, right? that price in the market is what the farmer faces.
00:50
Zero profit is telling you that price is equal to average total cost.
00:55
So if we draw an average total cost curve, it would just touch the price line, reflecting that the farmer is breaking even, right? and the marginal cost curve goes through the minimum, right? marginal cost curves always go through the minimum of the average total cost curve, right? so that's perfect competition, zero economic profits.
01:20
Now there's going to be a change in demand.
01:22
So for b, we have to think about it is it a positive change in demand or a negative change in demand, right? and it says at the very beginning the demand has been rising, right? so, right, demand up.
01:42
So we're going to increase the demand, and that means the demand is going to be increased.
01:48
Right.
01:48
And now that means we have a new equilibrium price, right? and that new equilibrium price, which we trace over here for the shrimp farmer is going to change things, right? new equilibrium quantity...