Behalf

"Illustration" courtesy of:  https://www.craiyon.com "golden ticket"

How does using a "coupon work"?  We have 2 or 3 questions:

• Does it make some portion of a "purchase price" disappear or vanish into thin air?
• Does it allow a "manufacturer" or "producer" to pay some portion of a "purchase price" to a "store" on behalf of a "consumer" or customer?
• Are "coupons" non-magical or create an "IOU" on any discrepancy in taxable receipts?

They do or don't.

It's an accepted way to make "something" more affordable.  For that reason alone, it can or can't be questioned.

Backward or "unextreme couponing".