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Difficulty: HardLong-Run Costs and Production

Match each long-run production and cost concept on the left with its corresponding economic characterization or primary cause on the right.

  • Long-Run Average Total Cost Curve (Envelope Curve)The locus of points forming a lower boundary wrapper around short-run average total cost curves when all inputs are variable.
  • Minimum Efficient Scale (MES)The lowest output level at which a firm fully exploits scale economies and minimizes long-run average total cost.
  • Managerial Diseconomies of ScaleThe upward-sloping region of the long-run average cost curve stemming from administrative friction and coordination breakdown.
  • External Economies of ScaleCost advantages accruing to a firm due to industry-wide expansion, such as localized specialized labor pools and infrastructure.

Answer

The correct matches pair: 1) Long-Run Average Total Cost Curve (Envelope Curve) with the locus of points forming a lower boundary wrapper around short-run average total cost curves when all inputs are variable; 2) Minimum Efficient Scale (MES) with the lowest output level at which a firm fully exploits scale economies and minimizes long-run average total cost; 3) Managerial Diseconomies of Scale with the upward-sloping region of the long-run average cost curve stemming from administrative friction and coordination breakdown; and 4) External Economies of Scale with cost advantages accruing to a firm due to industry-wide expansion, such as localized specialized labor pools and infrastructure.
Each concept correctly maps to its theoretical foundation: the Envelope Curve envelops short-run cost curves; Minimum Efficient Scale marks the point of lowest unit cost; Managerial Diseconomies of Scale generate rising long-run costs due to bureaucracy; and External Economies of Scale lower unit costs through industry-wide technological or infrastructural growth.

Step-by-Step Solution

1
Analyze the structural construction of the Long-Run Average Total Cost (LRATC) curve.
Identify that LRATC acts as an envelope wrapping around short-run average cost curves because firms can adjust all production inputs in the long run.
In the long run, no factor of production is fixed, enabling the selection of the optimal plant size for any output.
2
Determine the economic significance of Minimum Efficient Scale (MES).
Identify MES as the threshold output level where economies of scale are exhausted and long-run unit costs reach their minimum.
Achieving MES is necessary for a firm to operate at peak long-run productive efficiency.
3
Examine the root cause of upward-sloping LRATC.
Associate rising long-run average costs with managerial inefficiencies and administrative bottlenecks in over-expanded firms.
As organizational scale expands past optimal boundaries, managerial coordination problems create internal diseconomies of scale.
4
Distinguish internal scale effects from external industry-wide effects.
Connect cost advantages derived from shared industry infrastructure and specialized labor to external economies of scale.
External economies lower the cost curves of all firms within an industry independently of an individual firm's internal scale decisions.

Key Concept

Long-Run Cost Concepts and Scale Economies
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Topics

Long-Run Costs and Production

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