In a competitive market with no externalities,
◦ the consumer surplus is equal to zero because of competition.
◦ buyers cannot control the price, so the consumer surplus is zero.
◦ at the equilibrium price, marginal benefit exceeds marginal cost.
◦ at the equilibrium price, marginal benefit equals marginal cost.
◦ at the equilibrium price, the total amount of consumer surplus equals the total amount of producer surplus.