Тест: Marchés Imparfaitement Concurrentiels — 10 въпроса

1. Qu'est-ce qu'un marché imparfaitement concurrentiel ?

A. Un marché où les producteurs ont un pouvoir de marché

B. Un marché avec un grand nombre d'offreurs et de consommateurs

C. Un marché où la concurrence est totalement libre et sans barrières

D. Un marché avec une seule offre très faible

Answer: (A)

Обяснение

Un marché imparfaitement concurrentiel se caractérise par le pouvoir de marché détenu par certains producteurs, notamment grâce à une concentration, des barrières à l'entrée ou des ententes. Contrairement à la concurrence pure et parfaite, ces marchés ne sont pas totalement libres et laissent place à des stratégies d'influence sur les prix et la quantité.

2. What distinguishes a monopoly from other market structures according to the revision sheet?

A. A monopoly involves only a few firms with strategic interdependence.

B. A monopoly is characterized by a single producer setting prices above marginal costs.

C. A monopoly always results from regulatory barriers.

D. A monopoly market has high competition and low barriers to entry.

Answer: (B)

Обяснение

A monopoly involves only one producer who can set prices above marginal costs, leading to inefficiency and market power. Unlike oligopolies, monopolies are singular and not composed of multiple firms.

3. Quelle est la principale différence entre un monopole et un oligopole ?

A. Les deux marchés ont beaucoup d'entreprises, mais le monopole a un prix fixé par l'État

B. L'oligopole ne comporte aucune entente entre les entreprises

C. Le monopole concerne plusieurs entreprises, l'oligopole une seule

D. Le monopole est une situation avec un seul producteur, l'oligopole avec quelques offreurs en interaction stratégique

Answer: (D)

Обяснение

Un monopole implique qu'un seul producteur contrôle entièrement le marché, étant ainsi price maker. En revanche, un oligopole regroupe peu d'offreurs qui interagissent stratégiquement, ce qui peut mener à des ententes ou à des conflits selon le dilemme du prisonnier.

4. Which of the following is NOT listed as a source of market power in the revision sheet?

A. Market concentration

B. Ententes between firms

C. Barriers to entry

D. Presence of a large number of small firms

Answer: (D)

Обяснение

The sheet emphasizes concentration, ententes, and barriers to entry as sources of market power; a large number of small firms suggests a competitive market, not market power.

5. Quelle est l'utilité de la politique de la concurrence ?

A. Réguler ces marchés pour protéger le consommateur et favoriser la concurrence

B. Favoriser les monopoles financiers

C. Supprimer toutes les barrières à l'entrée

D. Augmenter le pouvoir de marché des entreprises

Answer: (A)

Обяснение

La politique de la concurrence vise à réguler les marchés imparfaitement concurrentiels afin de protéger le consommateur, de favoriser une baisse des prix, d'encourager la diversité et l'innovation, et de limiter les abus de position dominante. Elle inclut la surveillance et la sanction des pratiques anticoncurrentielles.

6. According to the revision sheet, what is the main purpose of a cartel?

A. To promote competition and reduce prices.

B. To form a legal alliance to support innovation.

C. To fix prices and control production through an illegal entente.

D. To regulate barriers to entry legally.

Answer: (C)

Обяснение

A cartel is an illegal agreement between firms to fix prices and control output, reducing competition and increasing prices.

7. What is a key characteristic of a natural monopoly as described in the revision sheet?

A. It arises from economies of scale and is optimal in a single-market situation.

B. It is always created by government regulation.

C. It results from a lack of barriers to entry.

D. It involves a market with many small competitive firms.

Answer: (A)

Обяснение

A natural monopoly occurs when economies of scale make it most efficient for a single firm to serve the entire market, often due to high fixed costs and cost advantages.

8. Which mechanism described in the sheet explains why collusion in an oligopoly might be unstable?

A. The presence of a legal framework preventing collusion.

B. The dilemma of the prisoner, where firms might betray each other.

C. The absence of strategic interdependence.

D. The high number of small firms competing.

Answer: (B)

Обяснение

The dilemma of the prisoner illustrates the instability of collusion because firms have incentives to betray agreements and act in their own interest.

9. What role do regulation authorities play in markets described in the revision sheet?

A. They actively set prices to maximize efficiency.

B. They impose sanctions and regulate to prevent abuses and maintain competition.

C. They promote cartel formations to stabilize markets.

D. They eliminate barriers to entry for firms.

Answer: (B)

Обяснение

Regulation authorities aim to control market abuses, prevent anti-competitive practices, and promote fair competition, not directly setting prices or promoting cartels.

10. How does a monopole's pricing behavior impact overall social welfare as discussed in the sheet?

A. It leads to efficiency because the monopolist maximizes profit.

B. It causes a decrease in surplus and leads to underproduction, reducing social welfare.

C. It increases consumer surplus at the expense of producers.

D. It has no impact on social welfare.

Answer: (B)

Обяснение

A monopolist sets prices above marginal costs, resulting in reduced output and higher prices, which decreases total surplus and causes inefficiency.