The accompanying table describes the relationship between the number of workers hired by a call center each hour and the number of calls the call center can make each hour. The call center has only 1 telephone. The telephone costs the firm $5/hour (regardless of how many calls are made), and each worker is paid $10 per hour.
If the price of a telephone increases to from $5 to $10 an hour and nothing else changes, then:

Question

The accompanying table describes the relationship between the number of workers hired by a call center each hour and the number of calls the call center can make each hour. The call center has only 1 telephone. The telephone costs the firm $5/hour (regardless of how many calls are made), and each worker is paid $10 per hour.   
If the price of a telephone increases to from $5 to $10 an hour and nothing else changes, then:

Quizplus · Accepted Answer

Marginal cost is the change in total cost divided by the corresponding change in output as output changes from one level to another. This can also be measured by the change in variable cost, because fixed cost does not change as output changes. Here, because only the cost of the fixed input changed, there is no change in variable cost, so marginal cost does not change.

The Accompanying Table Describes the Relationship Between the Number of Workers