In: Economics
The local movie theater industry has a demand curve of P=26-.2Q for a movie showing (please note the decimal in front of the 2). It has a supply curve (MC curve) of $2, because the theater figures for each customer there will be a cleanup cost afterwards. In reality, a theater might sell food and drinks for extra profits, but this one does not.
a).
allocative efficiency is a state of an economy, when there is an optimum distribution of resources. Now, more specifically it represents a situation when price is equal to marginal cost, where the total surplus is maximum.
Here the marginal cost of movie is $2 movie showing, => the price of a ticket and the quantity that will result in allocative efficiency is “P=2”, => Q=(26-2)/2 = 12”.
This not practical because a producer charge price exactly equal to MC, where MC is constant then the economic profit of the producer will be zero. Here a producer will try to maximize its profit by charging more than MC and supplying less than the allocative level of output.
B).
Here the market demand schedule is “P = 26 – 2*Q”, => MR = 26 – 4*Q”. Now, at the optimum the MR must be equal to MC. So, at the optimum.
=> MR = MC, => 26 – 4*Q = 2, => Q = 24/4 = 6, => Q=6, and P=14. So, the profit maximizing price and the quantity are “P=$14” and “Q=6”.
C).
Consider the following fig.
Here the monopoly price and the quantity are “P2=14” and “Q2=6” respectively, => the profit is the area P2C2C1A2. So, the monopoly profit is given by, => P2C2C1A2 = (14-2)*6 = $72.
If this theater charges “P1=$20” for the front row sit, => “Q1=3” people will buy the tickets, => the addition profit is given by the area “P1A1B1P2 = (20-14)*3 = $18.
If this theater charges “P3=$5” for the senior citizen, => “Q3-Q2=10.5-6 = 4.5” people will buy the tickets, => the addition profit is given by the area “B2C1B3A3 = (5-2)*4.5 = $13.5.
If three prices instead of one charge then the total profit will increases by “$18+$13.5 = $31.5”.
D).
Let’s assume another theater open having same MC and the market demand schedule, => P = 26 – 2*Q. So, the profit function of theator1 is given below.
=> A1 = P*Q1 – MC1*Q1 = (26-2*Q1-2*Q2)*Q1 – 2*Q1 = 26*Q1 - 2*Q1^2 - 2*Q2*Q1 – 2*Q1.
=> A1 = 24*Q1 - 2*Q1^2 - 2*Q2*Q1, => FOC for profit maximization require dA1/dQ1 = 0.
=> 24 - 2*2*Q1 - 2*Q2 = 0, => Q1 = 6 – Q2/2, be the best respond function of theater1.
Now, the profit function of theator2 is given below.
=> A2 = P*Q2 – MC2*Q2 = (26-2*Q1-2*Q2)*Q2 – 2*Q2 = 26*Q2 - 2*Q2^2 - 2*Q2*Q1 – 2*Q2.
=> A2 = 24*Q2 - 2*Q2^2 - 2*Q2*Q1, => FOC for profit maximization require dA2/dQ2 = 0.
=> 24 - 2*2*Q2 - 2*Q1 = 0, => Q2 = 6 – Q1/2, be the best respond function of theater2.
Now, by simultaneously solving the above two equation we got “Q1=Q2=4”, => total output supplied by both the firms are “Q=8”, => the market price is “P=10”.
Consider the following fig.
Here “P2” and “Q2” the price and quantity under the monopoly market and “P3=10” and “Q3=8” are the same under the Cournot duopoly market model. So, under the second case the price is lower but the total output supplied is more.