If the marginal cost of producing the 501st unit would be $19, producing and selling the 501st unit would decrease the firm's profit by $19.
A company that offers professional services is referred to as a firm. This can be a corporation, limited liability company (LLC), or partnership.
When you say someone is firm, you're implying that they act in a way that indicates they won't change their mind or that they are the one in charge. She needed to treat him firmly. The marginal cost, or price of producing more, is the adjustment to the total cost that results from increasing the quantity produced. Marginal cost is the additional cost incurred when producing a second good. Say, for instance, that it costs $100 to produce 100 automobile tires. An additional tire would cost $80 to produce.
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