Concept:In perfect competition, no single buyer or seller controls price.
Explanation:Price is set by the interaction of market demand and market supply.
This interaction creates an equilibrium price for all identical products.
Individual firms and buyers are price takers, not price makers.
They cannot set a different price from the ruling market price.
Therefore, price is decided by impersonal market forces, not by government, sellers alone, or buyers alone.
Answer:D. market