Long Run Cost Curves Unit 3.2

Long Run Cost Curves

Overview of Long Run vs. Short Run

• Short Run:

  • At least one input or resource in the production process is fixed.

• Long Run:

  • All resources are variable.

  • The shape of the firm’s long-run average total cost (LRATC) curve is influenced by economies of scale.

Understanding Scale

• Scale:

  • Refers to the size of a firm’s operations.

  • Scale of Production: The firm’s relationship between inputs and outputs.

• Altering the scale of production can lead to three distinct outcomes:

  • Increasing Returns to Scale

  • Constant Returns to Scale

  • Decreasing Returns to Scale

Long Run Returns to Scale

• Increasing Returns to Scale:

  • Output increases at a faster rate than inputs.

• Constant Returns to Scale:

  • Output increases at the same rate as inputs.

• Decreasing Returns to Scale:

  • Output increases at a slower rate than inputs.

Economies and Diseconomies of Scale

• Economies of Scale:

  • Explanation for why the firm’s average total cost (ATC) decreases as it expands its scale of operations.

  • Key sources include:

  • Specialization of resources.

  • More efficient use of equipment.

  • Reduction in per-unit costs of factor inputs.

  • Effective use of production by-products.

  • Increase in shared facilities.

• Diseconomies of Scale:

  • Explanation for why the firm’s average total cost (ATC) can increase as it increases its level of production.

  • Key sources include:

  • Limitations on effective management decision-making.

  • Competition for factor inputs.

Long Run Costs of Production

• Long Run Cost Relationship:

  • Represents the relationship between outputs and long run costs.

  • Economies of Scale:

  • Downward slope of the curve indicates that long run average total cost decreases as output increases.

  • Contributing factors:

    • Buying in bulk.

    • Cheaper capital or technological advancements.

    • More effective management.

• Constant Returns to Scale:

  • Long run average total cost remains the same as output increases.

  • Benefits from bulk purchases and reduced costs of capital.

• Minimum Efficient Scale (MES):

  • The point at which long run average total cost is minimized.

  • Indicates that the company can produce its product at a competitive price relative to other firms in the industry.

• Diseconomies of Scale:

  • Upward slope of the curve indicates that long run average total cost increases as output increases.

  • Causes may include distant and ineffective management and a scale of production that is too large for efficient operation.

Visual Representations

• Per Unit Cost: A graphical representation showing the relationships among economies of scale, minimum efficient scale, and diseconomies of scale relative to output.

Conclusion

• Understanding these concepts is crucial for evaluating a firm's operational efficiency and decision-making regarding scaling production.

• The interplay between economies of scale and diseconomies of scale is fundamental in determining a firm's cost structure and competitive strategy.

• Engage with additional resources and exercises to reinforce understanding of these critical economic principles.

Activities

• UNIT 3 ACTIVITY 3-3.1:

  • A Firm's Long-Run Average Total Cost Curve

  • Assessment of understanding related to the concepts of long-run average costs, economies of scale, and diseconomies of scale.

• Reference videos and explanations (such as those by AP Economics educators) for further clarity on these concepts.