Why perfect market is unrealistic and can not be acheived?

A perfect market is unrealistic because it assumes conditions that are rarely, if ever, met in the real world. Key assumptions include perfect information for all participants, no transaction costs, and a large number of buyers and sellers, all of whom act rationally. In reality, information asymmetry, market power, and behavioral biases often lead to inefficiencies and distortions. Additionally, barriers to entry and externalities further prevent the existence of a perfectly competitive market.