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6. (3 points) Suppose that a monopoly can price discriminate between two markets: market 1 where the demand curve is given by

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Answer #1

a) Demand for market 1 is q1=2-p1

or, p1=2-q1

Then, total revenue TR1=p1q1=2q1-q12

and marginal revenue MR1= dTR1/dq1 = 2-2q1

Similarly, Demand for market 2 is q2=4-p2

or, p2=4-q2

Then, total revenue TR2=p2q2=4q2-q22

and marginal revenue MR2= dTR2/dq2 = 4-2q2

Given: C=1 per unit

Then, MC=0

Now, for profit maximization in each market, MR1=MR2=MC

Then, 2-2q1=0

or, q1=1 and p1=2-1=$1

and 4-2q2=0

or, q2=2 and p2 = 4-2=$2

Then, p1M=$1,q1M=1 unit, p2M=$2,q2M=2 units

b) If price discrimination is no longer possible,

q=q1+q2

or, q=2-p+4-p (where p1=p2=p)

or, q= 6-2p

or, p=3-(q/2)

Then, Total revenue TR=pq=3q-(q2/2)

and marginal revenue MR=3-q

Now, for profit maximization, MR=MC

or, 3-q=0

or, q=3

and p=3-(3/2)=$1.5

Then, pM=$1.5 and qM=3 units

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