Fixed Cost. Marginal Cost. Fixed Cost. Marginal Cost


 Erin Powers
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1 1. Complete the following table (round each answer to the nearest whole number): Output Total Variable Fixed Marginal Average Avg. Var. Avg. Fixed Output Total Variable Fixed Marginal Average Avg. Var. Avg. Fixed A firm's total cost function is given by the equation: TC Q + 10Q. (1) Write an expression for each of the following cost concepts: a. Total Fixed b. Average Fixed c. Total Variable d. Average Variable e. Average Total f. Marginal () Determine the quantity that minimizes average total cost. Demonstrate that the predicted relationship between marginal cost and average cost holds. PART (1) a. TFC 4000 SD&GY_01101/
2 b AFC Q c. TVC TC TFC TVC 5Q + 10Q d. AVC TVC 5Q + 10Q Q Q Q e. ATC TC Q + 10Q Q Q f. MC 5 + 0Q SD&GY_01101/
3 PART () ATC is minimized where MC is equal to ATC. Equating MC to ATC Q + 10Q Q 5+ 0Q Q Q + 0Q Q Q 400 Q 0 SD&GY_01101/
4 ATC is minimized at 0 units of output. Up to 0, ATC falls, while beyond 0 ATC rises. MC should be less than ATC for any quantity less than 0. For example, let Q 10: MC 5 + 0(10) ATC 10 ( ) + 10( 10) 505 MC is indeed less than ATC for quantities smaller than 0. MC should exceed ATC for any quantity greater than 0. For example, let Q 5: MC 5 + 0(5) ATC ( 5) + 10( 5) MC is indeed greater than ATC for quantities greater than Acme Container Corporation produces egg cartons that are sold to egg distributors. Acme has estimated this production function for its egg carton division: Q 5, where Q output measured in one thousand carton lots, labor measured in person hours, and capital measured in machine hours. Acme currently pays a wage of $10 per hour and considers the relevant rental price for capital to be $5 per hour. Determine the optimal capitallabor ratio that Acme should use in the egg carton division. Equate MRTS to w r..6.4 ( 5) ( 5) MRTS 15 MRTS 10 MRTS ; SD&GY_01101/
5 4. Davy Metal Company produces brass fittings. Davy's engineers estimate the production function represented below as relevant for their longrun capitallabor decisions. Q , where Q annual output measured in pounds, labor measured in person hours, capital measured in machine hours. The marginal products of labor and capital are: Davy's employees are relatively highly skilled and earn $15 per hour. The firm estimates a rental charge of $50 per hour on capital. Davy forecasts annual costs of $500,000 per year, measured in real dollars. a. Determine the firm's optimal capitallabor ratio, given the information above. b. How much capital and labor should the firm employ, given the $500,000 budget? Calculate the firm's output. c. Davy is currently negotiating with a newly organized union. The firm's personnel manager indicates that the wage may rise to $.50 under the proposed union contract. Analyze the effect of the higher union wage on the optimal capitallabor ratio and the firm's employment of capital and labor. What will happen to the firm's output? a MRTS MRTS 0.75 w 15 Equate to. r ; SD&GY_01101/
6 b. c. C 500,000 C w + r 500, from optimal ratio 500, () 500, , Substitute to solve for. Substitute into C: 14,85.71 or 14,86 hours 500,000 15(1486) ,000 14, , or 5714 Q 500(14,86) (5,714) 0.8 Q 157,568,191 MRTS 0.75 w.5 New 5 r 50 w.5 Equating MRTS to. r , , () 500, , ,53.8 or 9,54 fell from 14,86 to 9,54. Substitute to solve for. remains constant. 500,000.50(9,54) , ,714.0 or 5,714 SD&GY_01101/
7 5. Q 500(954) (5714) 0.8 Q 13,541,771.8 Output fell from 157,568,0.5 to 13,541, a. Homer's boat manufacturing plant leases 50 hydraulic lifts and produces 5 boats per period. Homer's shortrun cost function is: C ( q, ) , where q is the number of boats produced and is the 5 q 5 number of hydraulic lifts. Homer's longrun cost function is: ( ) 10 7 C q q. At Homer's current shortrun plant size, calculate Homer's shortrun average total cost of production. If Homer would lease 11 more hydraulic lifts in the short run, will his shortrun average total cost of producing 5 boats increase or decrease? Does Homer's longrun cost function exhibit increasing, constant, or decreasing returns to scale? R At Homer's current shortrun plant size, Homer's shortrun average total cost of production is: 5 15( 5) ( 50) ( 50) ATC (5, 50) If Homer leases an additional 11 hydraulic ( 5) + 00( 61 5 ) ( 61) lifts, shortrun average total costs become: ATC (5, 61) We 5 see that Homer's shortrun average total costs decrease if he uses 11 additional hydraulic lifts. ( ) CR q q Homer's longrun average costs are: ACR ( q) q. Since q q longrun average costs increase as output increases, Homer's production process has decreasing returns to scale. b. Marge's Hair Salon uses 15 hair dryers to produce 10 units of output per period. Marge's shortrun cost 15q function is: C ( q, ) + 1, where q is the number of units produced and is the number of hair dryers Marge leases. Marge's longrun cost function is: C ( q) 6.8 q. If Marge used 4 fewer hair dryers in the shortrun, would shortrun average total costs increase or decrease? Does Marge's longrun cost curve exhibit increasing, constant, or decreasing returns to scale? R ( 15) 15 10, If Marge uses 4 fewer hair dryers in the short run, her shortrun average total costs become: 15( 10) + 1( 11) 11 SRATC ( 10,11) If Marge uses 4 fewer dryers and produces units, here shortrun average total costs decrease. Marge's longrun average costs are: CR ( q) 6.8q RAC 6.8. We see that Marge's longrun average costs are constant. q q This implies that Marge's cost curve exhibit constant returns to scale. Currently, Marge's shortrun average costs are: SRATC ( ) ( ) SD&GY_01101/
8 c. Apu leases squishy machines to produce 40 squishies in the short run. Apu's shortrun cost function is: q C ( q, ) , where q is the number of squishies produced and is the number of squishy machines used. Apu's longrun cost function is: ( ) 3 C q 1.13 q. If Apu decides to lease 7 squishy machines, what happens to Apu's shortrun average total cost of producing 40 squishies? Does Apu's longrun cost function exhibit increasing, constant, or decreasing returns to scale? R ( 40) ( 7) With squishy machines, Apu's shortrun average total costs are: ( 40) ( ) ( ) SRATC ( 40, ) If Apu leases 7 squishy machines, his short ( 7) run average total costs become: SRATC ( 40, 7) easing 5 40 additional squishy machines lowers Apu's shortrun average total cost by 91%. Apu's longrun average cost curve is: RAC ( q) q Since Apu's longrun average costs q q 3 decrease as output increases, Apu's cost curve exhibit increasing returns to scale. 6. The cost of producing 600 small fiberglass sailboats per year, and the cost of producing sails and fittings necessary to make the boats seaworthy in a single plant, are together $780,000. If produced in separate plants, the boats would cost $540,000, and the sails and fittings would cost $180,000. From this information, what can be learned about (1) economies of scale and () economies of scope in the production of sailboats, sails, and fittings? Perform any necessary calculations and explain. The above information says nothing about economies of scale. However, one can calculate the degree of economies of scope. Use equation (7.7). C Q SC ( 1) + C( Q ) C( Q 1,Q ) C( Q,Q ) 540, , , , Since SC is negative but close to zero, there are slight diseconomies of scope. q 16, where q is the number of units 3 A 8 produced and A is the time in months that eann's manager has spent on the job. What happens to production costs as the manager gains more experience on the job? Is this experienceeffect common in production processes? 7. eann's Telecommunication firm longrun cost curve is: C ( q) 3 4 Increases in A will reduce the average cost of production for any quantity. This implies that as the manager gains job experience, eann's cost of production will decrease. SD&GY_01101/
9 Suppose that eann is producing 16 units and the manager has 1 month experience. eann's costs are: ( ) ( 16) ( 1) experience, eann's costs are: C ( ) 3 4 C If eann's manager has 56 months of 3 8 ( 16) ( 56) This experienceeffect of the manager is referred to in economics as a "learningcurve" effect. Many production processes exhibit a learningcurve effect. That is, more time spent performing an activity results in greater efficiency and smaller costs. 8. Murray Manufacturing Company produces pantyhose. The firm's production function is given as: Q 5, where Q pairs of pantyhose, labor measured in person hours, and capital measured in machine hours. Murray's labor cost, including fringe benefits, is $0 per hour, while the firm uses $80 per hour as an implicit machine rental charge per hour. Murray's current budget is $64,000 per month to pay labor and capital. a. Given the information above, determine Murray's optimal capital/labor ratio. b. Using the agrangian technique, determine the quantities of labor and capital that will allow the firm to maximize output given their budgeted input expenditure. What is the firm's output? c. Again using the agrangian technique, demonstrate the duality in production and cost theory. 3 8 a. optimal capital/labor ratio w r Q 5 Q Equating w r : SD&GY_01101/
10 b. agrangian is to maximize Q subject to cost constraint. Max Q 5 subject to 64, Form the agrangian function G 5 + λ(64, ) G 5 + λl64,0000λ  80λ First order conditions are: ( 1) ( ) ( 3) G 50λ 0 G 580λ 0 G 64, λ Solve (1) and () to eliminate λ. 5 0λ λ λ λ Solve with expression for G. λ 64, , , , (1600) SD&GY_01101/
11 1600, 400 Q 0.5(1600)(400) Q 3,00,000 c. To demonstrate duality one must show that cost minimization approach leads to same answer as maximizing quantity. Minimize C subject to 3,00,000 5 Form agrangian function: G * λ(3,00,0005) G * λ3,00,0005λ First Order Conditions are: ( 1) ( ) * G 05λ 0 * G 805λ 0 G λ ( 3) 3,00, Solve 1 and to eliminate l. 05λ λ 0 0 /  5 λ 0 80 /  5 λ 0 0 /  80 / 0 Combine with 3 to solve for and. 0 /  80 / 0 3,00, SD&GY_01101/
12 Multiply top equation by ,00, ,00, ,00, ,00, ,00,000,560, ,00,0005(1600) ,00, We find the identical and as with output maximization approach. SD&GY_01101/
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