00:01
So here we have a monopolistically competitive industry, right? and let me try to reproduce this diagram.
00:06
We have a relationship between quantity and price.
00:09
We have a demand curve.
00:11
We have a marginal revenue curve.
00:15
And we have a marginal cost curve, right? the intersection of marginal revenue and marginal cost is 150.
00:23
And when you project that up to the demand curve, you get a price of 30, right? a monopolistically competitive firm always wants to set marginal revenue equals to marginal cost because it maximizes profit.
00:39
So as a result, we get q is equal to 150 and p is equal to 30.
00:45
Now, what about profit, right? profit here, right, if we are turning our attention to profit, profit is equal to revenue minus costs.
00:58
But this is equal to pq minus total cost, which is equal to q outside of p minus tc over q, if we factor out a q, is equal to q minus p minus atc, right? so profit depends on this gap between price and average total cost...