Final answer:
The justification for primarily focusing on service in warehousing is that the increase in revenue from improved sales will outweigh the additional costs incurred.
Step-by-step explanation:
When a warehouse is primarily justified on service, the supporting rationale is that increases in revenue from sales improvements will more than offset added cost. The idea here is that better service leads to higher sales, as consumers benefit from increased productivity and can access a wider variety of goods at lower prices. Efficient warehousing can thus be a key component in a business strategy that focuses on customer satisfaction and competitive pricing.