Final answer:
Marginal opportunity cost increases as a business increases its output because not all inputs are equally productive. The cost of using additional resources may rise as a business expands its production.
Step-by-step explanation:
The concept in this question relates to economics and marginal opportunity cost. As a business increases its output, marginal opportunity cost increases. This is because not all inputs in a business are equally productive in all activities. As the business expands its production, it will need to allocate more resources, and the cost of using these additional resources may increase.