Define consumer and producer surplus and give a geometric interpretation of each.

Definition Definition Consumer surplus is the consumers' gain from trade. The consumer surplus is the area below the demand curve but above the equilibrium price, up to the equilibrium quantity. Producer surplus is the producer's gain from trade. The producer surplus is the area above the supply curve but below the equilibrium price, up to the equilibrium quantity. Consumer surplus is represented by Area A and producer surplus is represented by Area B.