Final answer:
The change in total revenue that results from selling one more unit of output is called marginal revenue. It can be positive or negative depending on the effect on total revenue.
Step-by-step explanation:
The change in total revenue that results from selling one more unit of output is called marginal revenue. It represents the additional income generated when a firm sells an additional unit of its product.
For example, let's say a company sells a product for $10 and sells 100 units. The total revenue would be $1,000. If the company decides to sell one more unit and the price remains the same, the total revenue would increase to $1,010. The marginal revenue in this case would be $10, as it represents the increase in revenue from selling that one additional unit.
Marginal revenue can be positive or negative. It is positive when selling one more unit increases total revenue, and it is negative when selling one more unit decreases total revenue.