How do economies of scale affect long-run average total costs for a firm?

Question

BlackTom AI · Accepted Answer

To tackle the question, I will evaluate each answer choice in light of how economies of scale influence the long-run average total cost (LRATC) curve.
Option 1: 'Long-run average total costs remain the same over a wide range of output.' This would imply constant returns to scale across a large output span, which contradicts the core idea of economies of scale where increasing the scale of production can reduce per-unit costs. Therefore this option is not consistent with typical LRATC behavior under economies of scale.
Option 2: 'Long-run average total costs rise over a wide range of output.' Rising LRATC with increased output would indicate diseconomies of scale or increasing average costs, which opposes the concept that larger-scale production often lowers average costs due to spreading fixed costs and more efficient input combinations. Thus this choice is not correct when discussing economies of scale.
Option 3: 'Not enough information is provided to determine the answer.' While the exact shape of a firm's LRATC can depend on industry, technology, and capacity, the standard economic understanding of economies of scale indicates that LRATC can decline as output increases due to spreading fixed costs and operational efficiencies. In many contexts, there is enough information to infer a decline over a range of output, making this option less appropriate.
Option 4: 'Long-run average total costs decline over a wide range of output.' This aligns with the core idea of economies of scale: as firms expand production, they can lower average costs by spreading fixed costs, achieving more productive efficiency, and utilizing resources more effectively. The statement captures the typical effect of economies of scale on the LRATC curve over a substantial output interval.
Overall, the reasoning shows that the only option consistent with economies of scale reducing LRATC over a broad range of output is the final one, while the other options misrepresent the potential behavior of LRATC under scale changes. The key concept is that increasing scale often yields lower average costs up to the point where diseconomies of scale or capacity limits might eventually set in, which is reflected in the selected choice.

How do economies of scale affect long-run average total costs for a firm?

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