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# Answer on Microeconomics Question for Ray

Question #42695
The total demand for good Q is Made up by two markets demand. Market A displays a price elasticity of -2 whereas market B -4. The firm presents a cost function of the form : 120 + 4Q. Find the price charged by the firm in the two markets and the quantities supplied
Market A: EdA = -2
Market B: EdB = -4
TC = 120 + 4Q.

To find the price charged by the firm in the two markets and the quantities supplied, we should use markup rule. A markup rule refers to the pricing practice of a producer with market power, where a firm charges a fixed mark up over its marginal cost.

P = Ed*MC/(1 + Ed)
MC = TC&#039; = (120 + 4Q)&#039; = 4
So, price in market A equals PA = -2*4/(1-2) = $8 PB = -4*4/(1-4) = 16/3 =$5.33

According to the rule of profit maximization:

P&#039;(Q)*Q + P - TC&#039; = 0
P&#039;(Q) = Ed, TC&#039; = MC = 4, so:

-2QA + 8 - 4 = 0
2QA = 4, QA = 2 units.
-4QB + 5.33 - 4 = 0
4QB = 1.33
QB = 0.33 units

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