unit 2

Overview of Perfect Competition and Decision-Making

  • Focus on firms in a perfectly competitive market.

  • Analyze the costs affecting decision-making, leading to a model for output production in both short run and long run.

  • Building on concepts about firms producing goods using resources.

Production and Costs

Understanding Costs

  • Cost of Production: Value of resources forgone to produce something.

  • Two categories of production costs in the short run:

    • Fixed Factors of Production: Resources decisions made in the past, cannot be changed currently.

    • Variable Factors of Production: Resources that can be adjusted based on current decisions.

Fixed and Variable Costs

  • Fixed Costs: Associated with fixed factors of production, remain unchanged regardless of output level. May also be called overhead costs.

  • Variable Costs: Associated with variable factors of production, can be altered based on output level.

  • Total production cost includes both fixed and variable costs.

    • Total Cost (TC) = Fixed Cost (FC) + Variable Cost (VC)

Average Fixed Cost (AFC)

  • Average Fixed Cost: Calculated as total fixed costs divided by the number of units produced. Falls as production increases due to 'spreading overhead'.

    • Example: If fixed costs are $1,000 and 10 units are produced, AFC = $100. As output increases, AFC reduces per unit.

    • Theoretically, AFC approaches 0 but never reaches it, even with infinite output.

Cost Structures and Their Implications

Analyzing Cost Data

  • Example data includes various levels of output with their respective costs.

    • Notable costs at zero output denote fixed costs (e.g., $75.60).

    • As output increases (1 to 10 units), corresponding variable costs increase.

Calculating Costs

  • Variable Cost (VC): Derived from Total Cost minus Fixed Cost.

  • Average Total Cost (ATC): Total cost per unit, affecting profitability.

    • ATC = AFC + AVC, where AVC is Average Variable Cost

Profitability and Pricing Strategies

Breakeven and Shutdown Points

  • Breakeven Price: Lowest price covering all costs, derived from average total cost (e.g., $43.36).

  • Shutdown Price: The price that, if below it, leads to losses greater than when not producing (e.g., $28.08). Producing below this price results in larger losses than the fixed costs alone.

Decision-Making Based on Costs

  • If market price is greater than ATC, firms can earn profits.

  • If market price is below AVC, it becomes unviable to produce, suggesting shutdown.

Marginal Cost (MC) and Output Decisions

  • Marginal Cost: The cost of producing one additional unit. Typically decreases initially due to increased efficiency, then rises due to diminishing returns.

  • MC functions as a supply curve in perfectly competitive markets; firms will produce until MC equals market price.

    • If P > MC, producing is beneficial; if P < MC, cease production.

Examples of MC and Profit Maximization

  • Important calculations involving the changes in total cost give insight into profitability decisions.

    • Example: If marginal cost for four units of output is less than the market price, maximizes profits at that quantity.

Conclusion

  • Understanding fixed and variable costs, along with concepts of average costs, breakeven and shutdown prices, is crucial in making informed production decisions in competitive markets.