Production functions - linear, homogeneous, Cobb-Douglas, CES production functions - short run and long run cost curves, derivation of cost functions from production functions, least cost combination of factor inputs - Question Bank

1. Which of the following is a property of a homogeneous production function of degree 'n'?
A) If all inputs are multiplied by 'x', output is multiplied by 'x'
B) If all inputs are multiplied by 'x', output is multiplied by 'x^n'
C) If all inputs are multiplied by 'x', output is multiplied by 'nx'
D) If all inputs are multiplied by 'x', output is multiplied by 'n'
2. A firm is producing at the least-cost combination of inputs. If the price of labor falls, the firm should:
A) Employ more capital and less labor
B) Employ more labor and less capital
C) Maintain the same input combination
D) Increase output to maintain the same ratio of marginal products to prices
3. The short-run cost curves (SRAC, SAC, SMC) are derived from the short-run production function where:
A) All factors are variable
B) One factor is fixed
C) Two factors are fixed
D) No factors are fixed
4. The relationship between the production function and cost function is that the cost function is derived by minimizing cost subject to:
A) A given profit level
B) A given output level
C) A given market price
D) A given total revenue
5. If P_L = $5, P_K = $10, and the production function is Q = L*K, what is the MRTS when L=10 and K=5?
A) 0.5
B) 1
C) 2
D) 5
6. A firm produces 100 units using 10 units of labor and 5 units of capital. If it doubles its inputs to 20 units of labor and 10 units of capital, and output increases to 150 units, what returns to scale are observed?
A) Increasing returns to scale
B) Constant returns to scale
C) Decreasing returns to scale
D) Diminishing marginal returns
7. Which of the following is NOT a factor influencing the shape of the long-run average cost curve?
A) Economies of scale
B) Diseconomies of scale
C) Law of diminishing marginal returns
D) Constant returns to scale
8. The point where the MC curve intersects the ATC curve is the:
A) Maximum point of ATC
B) Minimum point of ATC
C) Inflection point of ATC
D) Starting point of ATC
9. In the long run, if a firm doubles all its inputs and output more than doubles, it experiences:
A) Diseconomies of scale
B) Constant returns to scale
C) Increasing returns to scale
D) Decreasing marginal returns
10. Average product (AP) is maximized when:
A) Marginal product (MP) is zero
B) Marginal product (MP) equals average product (AP)
C) Marginal product (MP) is at its maximum
D) Total product (TP) is maximized
11. When marginal product (MP) is positive but decreasing, total product (TP) is:
A) Decreasing
B) Increasing at a decreasing rate
C) Increasing at an increasing rate
D) Constant
12. The total product curve in the short run typically shows:
A) Output increasing at a decreasing rate, then at an increasing rate
B) Output increasing at an increasing rate, then at a decreasing rate
C) Output increasing at a constant rate
D) Output decreasing initially and then increasing
13. If a CES production function has a substitution elasticity of 0.5, this implies:
A) Inputs are perfect substitutes
B) Inputs are complements
C) Inputs are imperfect substitutes, closer to complements
D) Inputs are imperfect substitutes, closer to perfect substitutes
14. Which production function is characterized by fixed proportions, meaning inputs must be used in a specific ratio?
A) Cobb-Douglas
B) CES
C) Leontief (Fixed Proportions)
D) Linear
15. Deriving cost functions from production functions involves substituting input prices into the:
A) Total revenue function
B) Production possibility frontier
C) Input combination that yields a given output at minimum cost
D) Demand curve
16. The short-run cost curves are derived from the production function assuming:
A) All inputs are variable
B) At least one input is fixed
C) The firm operates in the long run
D) Technological advancements
17. If the marginal product of labor (MPL) is 20 and the marginal product of capital (MPK) is 30, and the price of labor (P_L) is $10 and the price of capital (P_K) is $15, is the firm using the least cost combination of inputs?
A) Yes, because MPL/P_L = MPK/P_K
B) No, because MPL/P_L > MPK/P_K
C) Yes, because MPL/MPK = P_L/P_K
D) No, because MPL/MPK != P_L/P_K
18. Which cost curve is always downward sloping?
A) Marginal Cost (MC)
B) Average Variable Cost (AVC)
C) Average Fixed Cost (AFC)
D) Total Cost (TC)
19. If a firm is operating on the downward-sloping portion of its LRAC curve, it is experiencing:
A) Diseconomies of scale
B) Constant returns to scale
C) Economies of scale
D) Increasing marginal costs
20. In a Cobb-Douglas production function Q = L^0.5 * K^0.5, what is the elasticity of substitution?
A) 0.5
B) 1
C) 2
D) Infinity
21. A production function Q = 5L + 10K represents:
A) Cobb-Douglas with constant returns to scale
B) CES with elasticity of substitution greater than 1
C) Linear production function with perfect substitutability
D) Leontief production function with fixed proportions
22. The expansion path for a firm shows:
A) The least cost combination of inputs for each output level
B) The point of minimum average cost
C) The firm's optimal production strategy in the short run
D) The relationship between total cost and total revenue
23. The optimal (least cost) combination of inputs for a given output level occurs where the isoquant is tangent to the:
A) Isocost line
B) Expansion path
C) Average cost curve
D) Marginal cost curve
24. If the price of labor (P_L) increases while the price of capital (P_K) stays the same, the isocost line will:
A) Become steeper
B) Become flatter
C) Shift outward parallelly
D) Shift inward parallelly
25. An isocost line represents:
A) Combinations of outputs that cost the same to produce
B) Combinations of inputs that yield the same output
C) Combinations of inputs that result in the same total cost
D) Combinations of prices that result in the same total revenue
26. The slope of an isoquant is known as the:
A) Marginal rate of substitution (MRS)
B) Marginal rate of technical substitution (MRTS)
C) Rate of product transformation
D) Elasticity of substitution
27. What does the isoquant represent in production theory?
A) Combinations of inputs that yield the same total cost
B) Combinations of inputs that yield the same level of output
C) Combinations of outputs that yield the same profit
D) Combinations of prices that yield the same revenue
28. The condition for the least cost combination of factor inputs is often expressed as MPL / P_L = MPK / P_K, where P_L and P_K are prices of labor and capital. This can be rewritten as:
A) MPL * MPK = P_L * P_K
B) MPL / MPK = P_K / P_L
C) MPL + MPK = P_L + P_K
D) MPL - MPK = P_L - P_K
29. The 'least cost combination of factor inputs' refers to the point where:
A) Marginal product of labor equals marginal product of capital
B) The ratio of marginal products equals the ratio of input prices
C) Total cost is minimized for a given output level
D) Average cost is minimized
30. If a production function is Q = f(L, K), what is the marginal product of labor (MPL)?
A) ∂Q/∂K
B) ∂Q/∂L
C) Q/L
D) Q/K
31. A firm's cost function, C(Q), relates:
A) Output to revenue
B) Input prices to output
C) Total cost to the level of output
D) Total cost to the quantity of inputs
32. The shape of the short-run marginal cost (MC) curve is primarily determined by:
A) The law of diminishing marginal returns
B) Economies of scale
C) Constant returns to scale
D) The price of inputs
33. What does the law of diminishing marginal returns state?
A) Adding more of one input, while holding others fixed, will eventually increase total output at a decreasing rate.
B) Adding more of one input, while holding others fixed, will eventually decrease total output.
C) Adding more of one input, while holding others fixed, will eventually increase total output at an increasing rate.
D) Adding equal amounts of all inputs will lead to decreasing output.
34. When does a firm experience economies of scale in the long run?
A) As output increases, LRAC increases
B) As output increases, LRAC decreases
C) As output increases, LRAC remains constant
D) As output increases, LRAC becomes negative
35. Long-run average cost (LRAC) is the envelope of which curves?
A) Short-run marginal cost (SRMC) curves
B) Short-run average variable cost (SRAVC) curves
C) Short-run average total cost (SRATC) curves
D) Short-run fixed cost (SRFC) curves
36. In the long run, how are production inputs treated?
A) At least one input is fixed
B) All inputs are variable
C) Only labor is variable
D) Only capital is variable
37. The Marginal Cost (MC) curve intersects the Average Variable Cost (AVC) curve at:
A) Its highest point
B) Its lowest point
C) Its starting point
D) Its ending point
38. Which cost curve is typically U-shaped in the short run?
A) Average Fixed Cost (AFC)
B) Marginal Cost (MC)
C) Average Variable Cost (AVC)
D) Total Cost (TC)
39. Total Cost (TC) in the short run is the sum of:
A) Fixed Cost (FC) and Marginal Cost (MC)
B) Variable Cost (VC) and Marginal Cost (MC)
C) Fixed Cost (FC) and Variable Cost (VC)
D) Average Fixed Cost (AFC) and Average Variable Cost (AVC)
40. In the short run, as more of a variable input is added to a fixed input, what eventually happens to marginal product?
A) It increases indefinitely
B) It remains constant
C) It eventually diminishes
D) It becomes zero
41. What is the primary characteristic of a short-run production period?
A) All inputs are variable
B) At least one input is fixed
C) Firms can enter or exit the market
D) Technology is constantly changing
42. Which production function is a generalization of Cobb-Douglas and Leontief production functions?
A) Linear production function
B) CES production function
C) Homogeneous production function
D) Short-run production function
43. The Constant Elasticity of Substitution (CES) production function allows for:
A) Only fixed proportions of inputs
B) Perfect substitutability between inputs
C) A substitution elasticity other than one
D) No substitutability between inputs
44. What does the exponent 'α' represent in the Cobb-Douglas production function Q = A * L^α * K^β?
A) The elasticity of output with respect to capital
B) The elasticity of output with respect to labor
C) The total factor productivity
D) The rate of technological change
45. In the Cobb-Douglas production function Q = A * L^α * K^β, if α + β = 1, what kind of returns to scale does the function exhibit?
A) Increasing returns to scale
B) Decreasing returns to scale
C) Constant returns to scale
D) Diseconomies of scale
46. The Cobb-Douglas production function is typically represented as Q = A * L^α * K^β. What does 'A' represent in this equation?
A) Labor input
B) Capital input
C) Technological progress
D) Output quantity
47. A production function is said to be homogeneous of degree one if it exhibits:
A) Increasing returns to scale
B) Decreasing returns to scale
C) Constant returns to scale
D) Diminishing marginal returns
48. Which characteristic defines a linear production function?
A) Constant returns to scale
B) Increasing returns to scale
C) Decreasing returns to scale
D) Variable returns to scale
49. What does a production function fundamentally represent in economics?
A) The total revenue earned by a firm
B) The maximum output achievable with given inputs
C) The cost of producing a specific quantity of goods
D) The market share of a particular product
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