Which of the following is NOT a barrier to entry in a monopolised market?

1. A Option A: A key resource is owned by a single firm
2. B Option B: A single firm is very large
3. C Option C: The government gives a single firm the exclusive right to produce some good
4. D Option D: The costs of production make a single producer more efficient than a large number of producers

Answer checked 11 October 2026 · How we write and check questions