Answer:
a. large number of firms, they have differentiated products, and this is a monopolistic market model
b. large number of firms, they have standardized products, and this is a perfectly competitive market model
c. few number of firms, they have standardized products, and this is an oligopolistic market model
d. one number of firms, they have a single products, and this is a monopoly
Step-by-step explanation:
a. This first question is a monopolistic competition. this is because it has the following characteristics:
It has large number of firms, the products here are differentiated, there is no entry cost and also no exit cost in the long run. Entereing the market is challenging
b. this is a perfect competition, the characteristics are large number of firms, the products are identical and the entry and exit in the market is easy
c. this market is an oligopoly. it has a few firms, the products can be identical or they can be differntiated, and it has barriers to entry from what we have seen here.
d. this market is a monopoly. the firm is a single one, and due to the patent there are no new entries for any other firm.