Answer:
a) The marginal benefit is greater than the marginal cost of additional units.
Step-by-step explanation:
Cost-benefit analysis is the systematic process of wieghing various transactions based on comparism between their benefit and cost.
The rational storage business owner should compare the cost of building another section of storage units to the benefit from 100 renters.
If the additional cost is justified by the benefit then he can go ahead with the construction.