Concept:Charging different prices for the same commodity is known as price discrimination.
This is possible when a seller has market power to set prices.
Such power is not available in perfect competition, where a uniform price prevails.
So, price discrimination is a characteristic of a monopoly market.
Explanation:In perfect competition, many sellers offer identical goods and every firm is a price taker.
Therefore, no firm can charge different prices for the same product.
Similarly, a commodity market is only a place where raw materials or primary goods are traded, not a market structure.
Under monopolistic competition, products are differentiated, so sellers may charge different prices across brands.
But the term “same commodity” means identical products bought at different charges by different customers.
This situation arises mainly when a single seller or monopolist controls the market.
The monopolist can divide customers into groups and charge each group the maximum price it is willing to pay.
Thus, charging different prices for the same commodity is a leading feature of a monopoly market.
Answer:D. monopoly market