Producer surplus is A. the market price multiplied by the number of units sold by a firm. B. the difference between the highest price a consumer is willing to pay and the lowest price a firm would be willing to accept. C. the difference between the lowest price a firm would be willing to accept and marginal cost. D. the difference between the lowest price a firm would be willing to accept and the price it actually receives. E. the difference between the highest price a consumer is willing to pay and the price the consumer actually pays. How does producer surplus change as the equilibrium price of a good rises or falls? As the price of a good rises, producer surplus ▼ decreases remains unchanged increases , and as the price of a good falls, producer surplus ▼ remains unchanged increases decreases .