Marginal cost is A. a legally determined minimum price that sellers may charge. B. the cost of producing output. C. the additional benefit from consuming one more unit. D. the difference between the lowest price a firm would be willing to accept and the price it actually receives. E. the additional cost of producing one more unit. Why is the supply curve referred to as a marginal cost curve? A. It shows the difference between the highest price a consumer is willing to pay and the lowest price a firm would be willing to accept. B. It shows the willingness of consumers to purchase a product at different prices. C. It shows the price producers actually receive in the market. D. It shows the difference between the lowest price a firm would be willing to accept and the marginal cost of production. E. It shows the willingness of firms to supply a product at different prices.