Chapter 10 Pure Competition Study Notes

Microeconomics: Pure Competition

• Technological Advance and Competition

Four Market Models

Market Structures:

1. Pure Competition (Perfect Competition)

2. Imperfect Competition

3. Pure Monopoly

4. Monopolistic Competition

5. Oligopoly

Characteristics of the Four Basic Market Models

Characteristics of Pure Competition

• Very Large Numbers of Sellers: Many firms exist in the market.

• Standardized Product: All firms produce a homogeneous product.

• ”Price Takers": Firms accept the market price as given; they cannot influence it.

• Free Entry and Exit: Firms can freely enter or exit the market without restrictions.

Market Demand vs. Individual Demand

• Graphical Representation:

  • Market Demand (Industry): Slopes downward, showing a negative relationship between price and quantity.

  • Individual Firm Demand: Perfectly elastic, represented by a horizontal line at market price.

Purely Competitive Demand

• Perfectly Elastic Demand for a Firm:

  • A firm can sell as much as it wishes at the market price.

  • Demand graph appears as a horizontal line.

Revenue Formulas

1. Average Revenue (AR):

   • Defined as revenue per unit:

   • $AR = rac{TR}{Q} = P$

2. Total Revenue (TR):

   • Calculated as price times quantity sold:

   • $TR=P\cdot Q$

3. Marginal Revenue (MR):

   • Extra revenue from selling one more unit:

   • $MR = rac{ riangle TR}{ riangle Q}$

A Purely Competitive Firm's Demand and Revenue Curves

• Data Representation:

  • Example of product price and corresponding demand schedules provided in a table format.

Profit Maximization in Pure Competition

Total Revenue vs. Total Cost (TR–TC) Approach

• A competitive producer aims to maximize output where total revenue exceeds total cost by the greatest amount.

• Profit Calculation:
  $ext{Profit} = TR - TC$

• Filled Table detailing output, total costs, and profits is shown but not specified here.

MR = MC Approach for Profit Maximization

• Explanation:

  • For a price taker, price equals marginal revenue:
    $P = MR$

• Considerations for production include:

  • Should the firm produce?

  • What quantity should be produced?

  • Anticipation of economic profit or loss.

• Conditions for Profit Maximization:

  1. If MR > MC, profits increase with increased output.

  2. If MR < MC, profits decrease with increased output.

  3. If $MR = MC$, the firm finds profit max or loss min.

Efficiency in Pure Competition

• Long-Run Considerations:

  • In the long run, firms can enter or exit the market based on profitability.

  • Increased profits attract new firms, decreasing prices until profits normalize.

  • Productive Efficiency: Achieved at the lowest point on the average total cost (ATC) curve.

  • Allocative Efficiency: Achieved where price equals marginal cost (P = MC).

  • Triple Equality: $P = MC = ext{Minimum ATC}$

Technological Advance and Competition

• Entrepreneurs strive for innovation to increase profits by:

  • Reducing costs through new processes.

  • Developing new products.

• Examples: SpaceX, Tesla are cited as innovative companies.

Conclusion

• The chapter emphasizes that pure competition embodies characteristics that foster both market efficiency and response to consumer demand, embodying key microeconomic principles such as marginal analysis and competitive behavior in profit maximization.

Last Word: Impact of COVID Pandemic

• The pandemic significantly affected numerous sectors, leading to revenue declines especially visible in industries like:

  • Restaurants

  • Hotels

  • Rental Cars