Expansion of competitive boundaries which allows customers many choices is called a:

• A. monopoly
• B. price discrimination
• C. oligopoly
• D. contestable market

Answer: (D)

Verified step by step guidance

1. Understand the key terms related to market structures: monopoly, price discrimination, oligopoly, and contestable market.
2. Recall that a monopoly is a market with a single seller and no close substitutes, limiting customer choices.
3. Recognize that price discrimination involves charging different prices to different customers, but does not necessarily expand choices.
4. Know that an oligopoly is a market dominated by a few firms, which may limit choices but not necessarily expand them.
5. Identify that a contestable market is characterized by low barriers to entry and exit, which increases competition and expands customer choices by allowing many potential competitors.