Final answer:
Non-carrier cases refer to situations where a non-merchant seller delivers the item or the buyer picks it up in a business transaction.
Step-by-step explanation:
In business transactions, there are different types of cases depending on whether the seller is a merchant or a non-merchant. In this question, we are specifically looking at cases where the seller is a non-merchant and the buyer either picks up the item or the seller delivers it. These cases are referred to as non-carrier cases.