It gets larger and larger happens to the difference between price and marginal revenue. Hence, option A is correct.
The margin of profit is equal to the sale price of a subsequent item sold. To calculate a company's marginal revenue, divide the variation in its total revenue by the variation in its total output volume. Marginal revenue is the selling price of one additional item that was sold.
Marginal revenue is the additional income generated by selling one more unit of output. Although marginal revenue can remain constant at a given level of output, the law of diminishing returns eventually causes it to start declining as output level increases.
Thus, option A is correct.
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