Answer: The answer is provided below
Step-by-step explanation:
Coffee shop chain:
Many firms are supplying the needs of the market. But there is one particular coffee shop that has many customerw because it tastes bette. It is a differentiated product due to the fact that consumers feels it tastes is better than the taste of others. This is monopolistic competition.
White socks company:
Many firms arr producing the same output. This is a standardized product because each firm produces same homogenous output. This is a perfect competition. In a perfect competition, each firm is the price taker.
Taxi companies:
Few firms, or to be more precise only two taxi companies are in the market. We can deduce that their product is anything homogenous because the customers do not differentiate. Therefore the firms are in the oligopoly market.
Patented drug:
Only one single firm is in operation in the market, therefore this is a monopoly. There is one single seller in the market selling a unique drug that no firm else sells.