Question

select the correct answer.
jack, jamie, ronnie, and stephan own the only computer software manufacturing companies in the country. when jack increases the price of his product and advertises extensively to promote it, the other three manufacturers immediately increase their prices and launch promotional strategies. what type of market structure do these four companies operate in?
a. oligopoly
b. monopolistic competition
c. monopoly
d. perfect competition
e. natural monopoly

Explanation:

• Oligopoly: In an oligopoly, a small number of firms dominate the market. Here, four companies (Jack, Jamie, Ronnie, and Stephan) control the computer software manufacturing in the country. When one firm (Jack) changes its price and promotional strategy, the other firms (Jamie, Ronnie, Stephan) follow suit. This interdependence among firms is a key characteristic of an oligopoly.
• Monopolistic competition: In monopolistic competition, there are many firms. Each firm's product is slightly differentiated. But in this case, there are only four firms, so it does not fit the "many - firms" characteristic of monopolistic competition.
• Monopoly: A monopoly has a single firm in the market. Here, there are four firms, so it is not a monopoly.
• Perfect competition: In perfect competition, there are many firms, and each firm is a price - taker. Firms in perfect competition do not have the ability to influence the market price through advertising or price - setting strategies as described in the problem.
• Natural monopoly: A natural monopoly occurs when economies of scale are so large that one firm can produce at a lower cost than multiple firms. The problem does not mention cost - related economies of scale that would lead to a natural monopoly situation.

Answer:

A. oligopoly