Diseconomies of Scale
What is Diseconomies of Scale?
Diseconomies of scale occur when long-run average total cost increases as output increases.
This results from coordination problems, communication breakdowns, or bureaucracy as a firm becomes too large. It causes per-unit costs to rise, reducing efficiency and profitability at higher output levels.
Diseconomies of Scale: a worked example
A parcel company compares three network sizes in the long run, when it can change trucks, depots, and management layers. A single small depot moves 1,200 packages a week at a long run average total cost of $7, so total cost is 1,200 × 7 = $8,400. A mid-size network moves 3,000 packages at $6 each, or $18,000. Building one giant hub lifts volume to 5,000 packages, but LRATC rises to $9, giving 5,000 × 9 = $45,000. Compare that last step: output climbed from 3,000 to 5,000, up about 67 percent, while total cost climbed from $18,000 to $45,000, up 150 percent. Cost rising faster than output is diseconomies of scale, and the extra dispatchers, shift supervisors, and rerouting delays are where the money went.
The mistake students make with diseconomies of scale
Diseconomies of scale gets mixed up with diminishing marginal returns, and the two really do both push costs up. The difference is the time frame and what can change. Diminishing returns is a short run story: the plant is fixed and extra workers crowd the same machines, pushing marginal cost and average variable cost up. Diseconomies of scale is a long run story: the firm has already built a bigger plant, hired more managers, and still finds long run average total cost rising. If the question says short run or mentions a fixed input, diminishing returns is the answer.
Diseconomies of Scale questions
What causes diseconomies of scale?
Coordination costs grow faster than the firm does. Layers of management get added so decisions travel through more hands, information gets distorted on the way up and down, and accountability thins out when no single person owns a result. Large workforces also make monitoring harder, so shirking rises. Physical limits matter too, such as a single distribution hub that jams once volume passes what its docks can handle. Each of these raises long run average total cost.
Where do diseconomies of scale show up on the LRATC curve?
Diseconomies of scale occupy the upward sloping right hand portion of the long run average total cost curve, past the flat stretch where returns to scale are constant. Reading left to right, the curve falls through the economies of scale range, flattens once output reaches minimum efficient scale, then turns up as coordination costs build. On a free response question, label the rising section and state that per unit cost is climbing as the firm builds larger plants.
Can a firm avoid diseconomies of scale?
Firms fight coordination problems by splitting into smaller divisions with their own budgets, pushing decisions down to plant managers, or running several mid-size plants instead of one enormous one. A chain that opens a second warehouse rather than doubling the first is choosing to stay near the bottom of the long run average total cost curve. The strategy is to reproduce the efficient plant size rather than stretch a single site past the point where costs per unit start rising.
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