Concept:Perfect competition is defined by many sellers, identical products, free entry/exit, and perfect knowledge, not by equality of supply and demand.
Explanation:Characteristics of perfect competition include homogeneous products, many buyers and sellers, perfect knowledge, and no advertising.
Supply and demand being equal is an equilibrium condition, not a structural characteristic of perfect competition.
Therefore, option A is NOT a character of perfect competition.
Answer:A. Supply and demand are equal