Answer:
Post office pricing
Step-by-step explanation:
Some stores who are into sales of certain goods also maintains a website for the goods sold in the store so that poeple can order goods through it and get them delivered . The fee charged is flat such that the delivery can be anywhere in the United States and same amount will be paid for the delivery irrespective of where the order came from.
Store owners useses post office pricing for conviniecies purpose. The owner owns the store and also runs a website for the promotion and ordering of his/her goods. Customers would also find this easier because their order will be made in a single spot instead of ordering somewhere and getting their goods in other place.