4) Three managers of the Magic Potion Company are discussing a possible increase in production. Each suggests a way to make this decision. Harry: We should examine whether our company's productivity - gallons of potion per worker - would rise or fall. Ron: We should examine whether our average cost - cost per worker - would rise or fall. Hermione: We should examine whether the extra revenue from selling the additional potion would be greater or smaller than the extra Costs. GATH