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A firm has a production function Q=F(K, L) with the constant return to scale, where k is units of capital and L is united of labour. Input prices are r=$2 per unit of K and w=$1 per unit of L. When it produces 5 units of output, it uses 2 units of capital and 3 units of labour. When its long-run total cost is equal to $70, how much capital and labour it will employ to product how many units of output? What is the long-run average cost?

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Nusrat Fatima
Nusrat FatimaLv10
28 Sep 2019

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Related questions

The short-run production function of a profit maximizer firm is given by f(L) = 6L^(2/3), where L is the amount of labour it uses. The cost per unit of labour is w = 6 and the price per unit of output is p = 3.

1) How many units of labour will the firm hire?

2) How much output will the firm produce?

3) If the firm has no other costs, how much will its total profits be?

Q1) Soundscape Enterprises manufactures Sonoblast, a device that produces a high-pitched reminder to telemarketers that they have once again disturbed you just when you were sitting 1⁄2 down to dinner. The production function for Sonoblasts is given by the formula Q = 2KL where Q is in units of output per period, K is in machine-weeks per period, and L is in labour- weeks per period. The machine rental rate r is $512 per machine-week and the wage rate w is $128 per labour-week. In the short run, K is fixed at 4 machine-weeks per period.

a. Give the formulas for the short-run production function and the marginal product of labour (MPL) function.

b. Express variable cost (VC), total cost (TC), and marginal cost (MC) as functions of L and as functions of Q; and average variable cost (AVC), average fixed cost (AFC) and average total cost (ATC) as functions of Q.

c. At what level of Q is ATC minimized? What are the values of ATC and of MC at this level of output?

d. If K is increased to a fixed 16 units, at what level of Q is ATC minimized, and what are the values of ATC and of MC at this level of output?

e. In the long run, with all inputs variable, what is the optimal K/L ration with input prices unchanged? How many units of L and of K would be required to produce the levels of output in 1c and in 1d and what is the average cost of producing Sonoblasts in each case? Explain the relation between your results here and those for 1c and 1d.

- Essay Question:

Assume a firm uses two inputs in its production process: labour and capital. Using isocost and isoquant analysis, examine the possible effects of an increase in wage on the firm’s

(a) use of labour and capital

(b) long-run total and average costs.

- Problem Question:

a) Derive the cost minimizing input demands and the long-run total cost function for the following production functions assuming input prices w1 and w2:

(i) y = f(x1, x2) = 2x1 + x2

(ii) y = min(x1, 3x2)

b) For each of the production functions above, determine the short-run input demands and short run total cost function when input 2 is limited to x2 = 100 units

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