Answer:
Marginal cost is the money paid for producing one more unit of a good. Marginal revenue is the money earned from selling one more unit of a good.
Step-by-step explanation:
While revenue (which is also known as sales) refer to money earned from the sale of goods or rendering or service, cost refers to the expenses incurred in the process of generating the revenue.
Marginal in economics refers to additional unit and as such,
Marginal revenue is the amount earned from the sale of an additional unit of an item while
Marginal cost is the money paid or cost incurred in producing an additional unit of an item.