State True or False and justify your answer:

A monopolist can sell 10 units at a unit price of $12 and 9 units at a unit price of $13. This means that the marginal revenue of the 10th unit is $12.

The answer is false

Explanation:

In a single seller monopoly market, the producer has to decrease the price to sell more quantity, and all the quantity will be sold at the same price.

Total sales revenue for 9 units = 9 * $13
=$117

Total sales revenue for 10 units = 10 * $12
=$120

Marginal revenue of the 10th unit = Total sales revenue for 10 units - Total sales revenue for 9 units
=$120 - $117
=$3

The marginal revenue generated for the 10th unit is $3, not $12, therefore, the statement is false