Which of the following is not a feature of a perfect market?

Preferential treatment is not a feature of a perfect market. A perfect market is characterized by a large number of buyers and sellers, homogeneity of products, absence of transport costs, and perfect knowledge of market situation. In a perfect market, all buyers and sellers have equal access to information and no one is given preferential treatment over another. This ensures that prices are determined solely by supply and demand, without any outside influences. Therefore, preferential treatment would disrupt the balance of the perfect market and make it imperfect.