# Answer in Microeconomics for Esther #113329

Joint profit maximizing level of output means that we need to maximize sum of profits of both firms, i.e. act like a cartel:

“pi=pi1+pi2 to max(Q1, Q2)”

Profit of each firm equials earnings minus costs:

“pi1 = Q1*P(Q1+Q2) – C1(Q1)”

“pi2= Q2*P(Q1+Q2) – C2(Q2)”

This gives us equation for total profit:

“pi = Q1u2217P(Q1+Q2)u2212C(Q1) +Q2u2217P(Q1+Q2)u2212C(Q2)\\=P(Q1+Q2)*(Q1+Q2) – C(Q1)- C(Q2)”

In order to maximize “pi” we need to find its partial derivatives with respect to “Q1” and “Q2”:

“frac{partial pi }{partial Q1}= P(Q1+Q2)+(Q1+Q2)* frac{partial P}{partial (Q1+Q2)}*frac{partial (Q1+Q2)}{partial Q1} -frac{partial C1}{partial Q1}”

“frac{partial pi }{partial Q2}= P(Q1+Q2)+(Q1+Q2)* frac{partial P}{partial (Q1+Q2)}*frac{partial (Q1+Q2)}{partial Q2} -frac{partial C2}{partial Q2}”

By plugging in given formulas for cost functions and demand curves we get:

“frac{partial pi }{partial Q1}= 50 – 5*(Q1+Q2)+(Q1+Q2)*(-5)*1-10 = \\=40-10*(Q1+Q2)”

“frac{partial pi }{partial Q2}= 50 – 5*(Q1+Q2)+(Q1+Q2)*(-5)*1-12 = \\=38-10*(Q1+Q2)”

Technically, we should calculate such “Q1” and “Q2” that both derivatives mentioned above would be equial to zero. In our case it’s impossible, as firms have diffrent marginal costs. In such situation cartel will decide to produce only via the first firm (with minimum marginal costs), so profit maximization will effectively be maximazing “pi1” given that “Q2=0”: “pi1 = Q1*P(Q1) – C1(Q1) = Q1*(50-5*Q1) – 20 -10Q1=\\=50Q1-5*(Q1)^2-20-10Q1=\\=-5*(Q1)^2+40*Q1-20”

Joint profit maximizing output is 4

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