Answer:
variable costs
Explanation:
According to my research on monopolistically competitive firms, I can say that based on the information provided within the question they will continue to produce as long as the revenue covers variable costs. This term is defined as the costs that change as the quantity of the product that is being produced changes.
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This girl is in a reliable witness because she can't remember the date therefore she doesn't know if she was with him on his trip or not and she also stated that she doesn't remember who her traveling companion was