What does marginal revenue refer to?

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The extra profit a company gains from selling one more unit of product.The gap between total earnings and total expenses.The quotient of total income divided by the number of units sold.The additional income a business receives by producing and selling one extra unit.

Explanation

Marginal revenue is defined as the additional income a firm earns when it increases its output by one unit. It is not the profit gained, the difference between total revenue and cost, or the average revenue per unit.