# Week 4 cyu | Economics homework help

Week 4 – Check Your Understanding

Chapter 7:

 Crew Size Amount of Fish Caught Per Week (Hundreds of Pounds) 2 18 3 25.5 4 32 5 37.5 6 42 7 45.5 8 48 9 49.5 10 50 11 49.5 12 48 13 45.5

1.      The amount of fish caught per week on a trawler is a function of the crew size assigned to operate the boat. Based on past data, the following production schedule was developed: (3 points)

Over what range of workers are there:

a.      Increasing marginal returns  _______________________

b.      Decreasing marginal returns _______________________

c.       Negative marginal returns    ________________________

2.      Suppose the firm’s production function is given by the following relationship:

Q = 5 L 0.8 K 0.2

Where the exponents of L (labor) and K (capital) are interpreted as the fixed input elasticities of labor and capital, respectively.

a.      Determine the percentage increase in output (Q) if labor (L) is increased by 10 % while capital is held constant.

b.      Determine the percentage increase in output (Q) if capital (K) is increased by 20 % while labor is held constant.

c.       Determine the percentage increase in output (Q) if both labor (L) and capital (K) are increased by 20 %.

3.      Consider the following Cobb Douglas Production function for the bus transportation system in a particular city: (3 points)

Q = aLb1Fb2Kb3

Where L = labor input in worker hours

F= fuel input in gallons

K = capital input in number of buses

Q = output measured in millions of bus miles

The values of the parameters are: (Hint: See the interpretation of the exponents in Question 3.)

a = 0.0024

b1 = 0.50

b2 = 0.30

b3 = 0.15

a.      Suppose that the labor input (L) is increased by 2% next year (with the other inputs held constant). Determine the approximate percentage change in output (Q).

b.      Suppose that the capital input (K) is decreased by 2% next year (with the other inputs held constant). Determine the approximate percentage change in output (Q).

c.       What type of returns to scale appears to characterize this bus transportation system?  (Hint: add the exponents up. If the sum exceeds 1, there is increasing returns to scale, if it is less than 1, there is decreasing returns to scale, and if it equals 1, there is constant returns to scale.)

Chapter 8:

1.  A certain production process employs only labor (L).  Output (Q) is a function of labor given by the following relationship: (3 points)

Where MPL = 1200L 300L2

 (a) Determine the average product function for input L. (b) Find the number of units of input L that maximizes the total product function. (Hint: set MPL equal to zero and solve for L.) (c) Find the number of units of input L that maximizes the average product function. (Hint: set MPL equal to the APL equation found in part “a” and solve for L.)

2.   During the last few days the Superior Company has been running into problems with its computer system. The last run of the production cost schedule resulted in the incomplete listing shown below. From your knowledge of cost theory, fill in the blanks. (6 points)

 Q TC TFC TVC ATC AFC AVC MC 0 40 na na na na 1 52 2 20 3 21.33 4 4 5 40 6 15.67 7 10 8 96 9 15 10 45

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