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Economics

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The Ali Baba Co is the only supplier of a particular type of Oriental carpet. The estimated demand for its carpets is Q= 112,000 – 500P + 5M, where Q= number of carpets, P= price of carpets (dollar per unit), and M= consumers income per capita. The estimated average variable cost function for Ali Baba’s carpets is AVC= 2000 – 0.012Q + 0.000002Q2

Consumers income per capita is expected to be $20,000 and total fixed cost is $100,000
#1. How many carpets should the firm produce in order to maximize profit?
#2. What is the profit maximizing price of carpets?
#3. What is the maximum amount of profit that the firm can earn selling carpets?
#4. Answer parts a through c if consumer’s income per capita is expected to be $30,000 instead.

  • Economics -

    This is a straight monopoly problem; set MC=MR and solve for Q, and then determine P. The tricky part is that the total cost function is a cubic.

    Since M is given, rewrite the demand equation as Q= 212,000 - 500P. Next rewrite so P is a function of Q. so P=424 - .002Q
    Now then TR=P*Q=424Q - .002Q^2
    MR is the first derivitive, so MR=424-.004Q

    TVC = AVC*Q = 2000Q-.012Q^2 + .000002Q^3
    MC is the first derivitive
    MC=2000 - .024Q + .000006Q^2

    My quadratic equation is 0=1576 - .02*Q + .000006Q^2.
    Which, by my calculations, does not have a solution, which means no maxima. Please Please check my math. I am confident in my methodology, less so in my arithmitic.

  • Economics -

    Economyst, could you elaborate on #1 and #4. I'm stuck!

  • Economics -

    for #1 Always always always, maximize when MC=MR. (Since you have a quadratic for an MC equation, you may have two points where MC=MR. One will represent where profits are maximized, the other where profits are minimized. In calculas, check second-order conditions. Or, for simplicity, test both answers and pick the one with the highest profit.) So, I set MR=MC as 424-.004Q=2000-.024Q+.000006Q^2. Rearranging terms, I got my quadritic equation; the next step is to solve for Q

    for #4. It is the exact same procedures as #1-#3, except with a different cost function. Here Q=262,000 - 500P

    I hope this helps.

  • Managerial Economics -

    The reason this cannot be worked out is because there is an extra 0 on the first term in the AVC = 2000 – 0.012Q + 0.000002Q2. It should really be AVC = 200 – 0.012Q + 0.000002Q2.

  • Economics -

    The estimated demand equation is Q = 112,000 – 500P + 5(20,000) = 212,000 – 500P.
    The inverse demand function is P = 424 – 0.002Q
    The marginal revenue is MR = 424 – 0.004Q
    The average variable cost is AVC = 200 – 0.012Q + 0.000002Q2
    The marginal cost is SMC = 200 – 0.024Q + 0.000006Q2
    a. How many carpets should the firm produce in order to maximize profit?
    To maximize profit, marginal revenue is set to equal marginal cost.
    MR = SMC = 424 – 0.004Q = 200 – 0.024Q + 0.000006Q2 = 224 + 0.020Q – 0.000006Q2
    Solving for Q, it is equal to 4666.67 and –8000. Since there can be no negative output, the firm should produce 4667 carpets.
    b. What is the profit-maximizing price of carpets?
    The profit maximizing price P = 424 – 0.002Q, when Q = 4667, the price is $414.33.
    c. What is the maximum amount of profit that the firm can earn selling carpets?
    The maximum amount of profit the firm can earn selling carpets is:
    (P * Q) – [(AVC * Q) + TFC] = (414.33 * 4667) – [(187.56 * 4667) + 100,000)] = $958,341.48
    d. Answer parts a through c if consumer’s income per capita is expected to be $30,000 instead.
    The estimated demand equation is Q = 112,000 – 500P + 5(30,000) = 262,000 – 500P.
    The inverse demand function is P = 524 – 0.002Q
    The marginal revenue is MR = 524 – 0.004Q
    The average variable cost is AVC = 200 – 0.012Q + 0.000002Q2
    The marginal cost is SMC = 200 – 0.024Q + 0.000006Q2
    To maximize profit, marginal revenue is set to equal marginal cost.
    MR = SMC = 524 – 0.004Q = 200 – 0.024Q + 0.000006Q2 = 1476 – 0.020Q + 0.000006Q2
    Solving for Q, it is equal to 5833.33 and –9166.67. Since there can be no negative output, the firm should produce 5834 carpets.
    The profit maximizing price P = 524 – 0.002Q, when Q = 5834, the price is $512.33.
    The maximum amount of profit the firm can earn selling carpets is:
    (P * Q) – [(AVC * Q) + TFC] = (512.33 * 5834) – [(198 * 5834) + 100,000)] = $1,733,801.22.

  • Economics -

    Demand Equation Q= 612000- 500P

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