Question 1

What conditions define long-run competitive equilibrium in perfect competition?

Accepted Answer

Long-run competitive equilibrium occurs when market price equals the lowest average total cost of production, resulting in zero economic profit for all firms. At this point, firms have no incentive to change production scale, and new firms have no motivation to enter the market. The market stabilizes because neither entry nor exit occurs.

Question 2

How do firms entering and exiting the market affect long-run equilibrium?

Accepted Answer

When existing firms earn above-normal profits, new firms enter, increasing market supply and reducing prices. Conversely, when firms incur losses, they exit, decreasing supply and raising prices. This continuous process of entry and exit continues until price settles at a point where remaining firms make zero economic profit, stabilizing the market.

Question 3

Why does demand increase initially attract new firms to a perfectly competitive market?

Accepted Answer

When demand increases, the market demand curve shifts, pushing market price upward. This allows existing firms to earn above-average profits. These higher profits attract new firms into the market, seeking to capitalize on the profitable opportunity. However, increased firm entry shifts market supply, eventually pushing prices back down.

Question 4

What role does average total cost play in determining long-run equilibrium price?

Accepted Answer

In long-run competitive equilibrium, the market price equals the minimum point on each firm's average total cost curve. Firms optimize their use of resources like labor, ovens, and ingredients to achieve this lowest cost. When price equals minimum average total cost, firms earn zero economic profit and have no incentive to adjust production.

Question 5

How does the digital streaming industry illustrate long-run competitive equilibrium?

Accepted Answer

When streaming platforms enter a market with high initial profits, increased content availability drives price competition. As more firms enter, market price falls to equal the minimum average total cost for existing firms. Without profit potential, new firms stop entering, and the market stabilizes in long-run competitive equilibrium.

Question 6

What makes perfectly competitive markets self-regulating in the long run?

Accepted Answer

Perfectly competitive markets self-regulate through the pursuit of self-interest by individual firms. When profits exist, firms enter; when losses occur, firms exit. This dynamic adjustment process continues until price stabilizes at minimum average total cost, achieving an efficient allocation of resources that benefits both producers and consumers.

Question 7

Why do bakeries in a competitive bread market eventually stop changing their production scale?

Accepted Answer

Bakeries optimize their use of labor, ovens, and ingredients to maximize profits. Over time, as new bakeries enter when prices are high and exit when prices are low, the market price settles where each bakery makes zero economic profit. With no profit incentive, bakeries have no reason to expand or reduce production scale.

Équilibre compétitif à long terme I

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