If the firm’s average cost curves are U-shaped, why does its average variable cost curve achieve

step 1 So the question here is to answer why we think the average and marginal cost curves have the sam

If the firm’s average cost curves are U-shaped, why does its...

Key Concepts

Spreading Effect of Fixed Costs

Fixed costs, which do not vary with output, are spread over an increasing number of units as production expands. This declining average fixed cost (AFC) component causes the ATC curve to be pulled downward at higher levels of production. Consequently, even after the AVC curve begins to rise due to diminishing returns, the total average cost may continue to decline for a while because the additional output further dilutes the fixed cost per unit, postponing the minimum point of the ATC curve relative to the AVC curve.

Average Total Cost (ATC) Curve

The ATC curve represents the per unit cost of production and is computed as the sum of average variable costs and average fixed costs (AFC). This curve is typically U-shaped because of economies to a point (where spreading the fixed costs and increasing efficiency lowers per unit cost) followed by diseconomies of scale (where factors like diminishing marginal returns increase costs). The presence of the fixed cost component in ATC delays the point at which the total cost per unit reaches its minimum compared to costs that exclude fixed expenses.

Average Variable Cost (AVC) Curve

The AVC curve measures the per unit cost that varies with the level of output, excluding fixed costs. It is also U-shaped, reflecting initially decreasing costs due to specialization and then rising costs when diminishing marginal returns set in. Since AVC does not include the fixed cost element, its minimum point is reached at a lower output level compared to ATC, which must offset the fixed cost impact spreading over larger quantities.

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