One explanation for the U-shaped average variable cost curve is that greater
Blank
______ yields more efficiency and variable cost per unit of output declines

Question

One explanation for the U-shaped average variable cost curve is that greater 
Blank
______ yields more efficiency and variable cost per unit of output declines

BlackTom AI · Accepted Answer

Specialization increases efficiency, so average variable cost (AVC) falls initially as workers or tasks become more productive.

1. Relevant knowledge points and concepts
- AVC = Variable Cost (VC) / Quantity (Q). Variable costs change with output (e.g., labor, materials).
- In the short run some inputs (capital) are fixed while variable inputs (labor) can change.
- The AVC curve is U-shaped because of two phases: increasing returns from specialization (AVC falls) and diminishing marginal returns to the variable factor (AVC rises).

2. Complete reasoning process step by step
- When a firm adds variable inputs and organizes work better (specialization/division of labor), each worker becomes more productive: Q rises faster than VC, so AVC = VC/Q declines.
- After an optimal point, adding more of the variable input yields smaller additional output per unit (diminishing marginal product), so Q increases more slowly while VC continues to rise, causing AVC to increase.
- These two effects produce the U-shaped AVC: initial decline due to specialization, subsequent rise due to diminishing returns.

3. Simple numerical illustration (intermediate steps)
- Suppose each worker costs $100 (VC per worker). One worker produces 10 units: VC = $100, Q = 10 → AVC = 100/10 = $10.
- With specialization, two workers produce 30 units total: VC = 200, Q = 30 → AVC = 200/30 ≈ $6.67 (AVC falls).
- Adding a fifth worker with overcrowding yields only 5 additional units: total VC = 500, Q = 50 → AVC = 500/50 = $10 (AVC rises again as diminishing returns set in).

4. Why the correct answer is correct
- Specialization directly explains the initial downward slope: better task allocation raises average productivity of variable inputs, reducing variable cost per unit. This is the classic microeconomic explanation for the left-hand downward segment of the U-shaped AVC.

5. Why other options are incorrect
- Capital: typically fixed in the short run, so changes in capital do not explain the initial AVC decline.
- Labor input: while labor is a variable input, the key mechanism is how labor is organized—specialization—not merely adding labor.
- Output: AVC is defined as VC per unit of output; output is the result, not the causal explanation for the initial efficiency gain.

6. Conclusion
Specialization is the factor that yields increased efficiency and an initial decline in variable cost per unit, confirming the correct answer: specialization.

One explanation for the U-shaped average variable cost curve is that greater Blank ______ yields more efficiency and variable cost per unit of output declines单项选择题

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