Perfectly Competitive Markets Quiz
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Questions and Answers

Which characteristic is NOT true for firms in a perfectly competitive market?

  • Goods are standardized and identical across sellers.
  • Sellers can influence the market price by adjusting their output. (correct)
  • Firms can freely set prices above the market price. (correct)
  • There are significant barriers to entry and exit. (correct)

What is the primary condition for a firm in a perfectly competitive market to maximize its profit?

  • Produce where MR = MC. (correct)
  • Produce where MC = AR.
  • Produce where P = AVC.
  • Shut down if P > ATC.

What happens to a firm's total cost if it produces zero output in the short run?

  • Total cost equals its variable costs.
  • Total cost is the sum of fixed and variable costs.
  • Total cost becomes zero.
  • Total cost equals its fixed costs. (correct)

Under which condition will a firm decide to shut down in the short run?

<p>Price is below average variable cost. (B)</p> Signup and view all the answers

Why do firms in a perfectly competitive market earn zero economic profit in the long run?

<p>Firms freely enter and exit, driving profits to zero. (A)</p> Signup and view all the answers

What corresponds to a firm's short-run supply curve in a perfectly competitive market?

<p>Its marginal cost curve above the minimum average variable cost. (B)</p> Signup and view all the answers

What occurs in a perfectly competitive market if there is an increase in market demand in the short run?

<p>Price increases, and firms earn positive economic profits. (A)</p> Signup and view all the answers

Allocative efficiency in a perfectly competitive market is achieved when:

<p>Firms produce where price equals marginal cost. (D)</p> Signup and view all the answers

Flashcards

Price Takers

In a perfectly competitive market, firms cannot influence the price of the good. They must accept the prevailing market price, and can only adjust their output.

Profit Maximization in Perfect Competition

The profit-maximizing output for a perfectly competitive firm occurs where the marginal cost of producing one more unit equals the market price. The firm maximizes profit by producing up to the point where the additional cost of producing one more unit equals the additional revenue from selling that unit.

Fixed Costs in the Short Run

In the short run, the firm's fixed costs are unavoidable, even if it produces zero output. These costs include expenses like rent or interest payments.

Short-run Shutdown Condition

A firm will shut down production in the short run if the price of the good is below the average variable cost. This means that the firm is not even covering the cost of producing each unit, and it's better to minimize losses by stopping production.

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Zero Economic Profit in the Long Run

In the long run, firms in perfect competition earn zero economic profit because of free entry and exit. As long as firms are making economic profits, new firms will enter, increasing supply and driving down prices. Conversely, if firms are losing money, firms will exit the market, decreasing supply and increasing prices. This process continues until profits are driven to zero.

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Short-Run Supply Curve

The short-run supply curve for a perfectly competitive firm is the portion of its marginal cost curve that lies above the minimum average variable cost. This is because the firm will only produce output if the price is high enough to cover its variable costs.

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Short-Run Market Demand Increase

In the short run, an increase in market demand will lead to an increase in the market price. Firms in perfect competition will then produce more in the short run, and earn positive economic profits.

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Allocative Efficiency

Allocative efficiency occurs in a perfectly competitive market when the price of the good equals the marginal cost of production. This means that society is producing the optimal amount of the good, as the value of the good to consumers is equal to the cost of producing it. In other words, the resources are being used to produce exactly the quantity of the good that is most beneficial.

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Study Notes

Perfectly Competitive Markets

  • Firms can freely set prices equal to the market price.
  • Goods are standardized.
  • Entry and exit in the market are not restricted.
  • Sellers have no influence on the market price, they are price takers.

Profit Maximization

  • The profit-maximizing rule for a firm in a perfectly competitive market is to produce where marginal cost (MC) equals marginal revenue (MR).
  • Alternatively, it's where MC = Price (P).
  • Firms should not shut down if price (P) is greater than average total cost (ATC).

Short-Run Costs

  • If a firm produces no output in the short run, its total cost equals its fixed costs.
  • A firm will shut down in the short run if the price is below average variable cost (AVC).

Long-Run Equilibrium

  • In the long run, firms in a perfectly competitive market earn zero economic profit.
  • Free entry and exit of firms drive profits to zero.
  • Price equals average total cost (ATC).

Short-Run Supply Curve

  • A firm's short-run supply curve is its marginal cost curve above the minimum average variable cost.

Market Equilibrium

  • If market demand increases in a short-run perfectly competitive market, price will increase, and firms will earn positive economic profits.

Allocative Efficiency

  • Allocative efficiency occurs in a perfectly competitive market when firms produce where price equals marginal cost.

Example Cost Schedule

  • Provided data in the document show a cost schedule for a firm.
  • Data includes quantities, total costs, and prices.
  • Students are asked to calculate marginal cost, determine the profit-maximizing output level, and calculate the firm's profit.

Shutdown Decision

  • Example situation provided in the document with market price, average variable cost, fixed cost, and quantity.
  • Students are asked to calculate total revenue, total cost, and profit for the firm and determine whether the firm should shut down.

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Description

Test your knowledge on perfectly competitive markets, including firm behavior, profit maximization, and cost structures. This quiz covers key concepts such as marginal cost, average total cost, and long-run equilibrium. Perfect for students studying microeconomics.

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