Share your insights or perspective on the financial matter presented in the input.

Why do grocery stores in the U.S. offer cash back so eagerly?
The only card I've seen offer this on credit card purchases is Discover.  I think they have a special deal with the stores so that the cash-over amount is not included in the percentage-fee the merchant pays.  (The cash part shows up broken-out from the purchase amount on the statement--if this was purely something the store did on its own without some collaboration with Discover that would not happen). The first few times I've seen the offer, I assumed it would be treated like a cash-advance (high APR, immediate interest with no grace period, etc.), but it is not.  It is treated like a purchase. You have no interest charge if you pay in full during the grace period, and no transaction fee.  Now I very rarely go to the ATM. What is in it for Discover?  They have a higher balance to charge you interest on if you ever fail to pay in full before the grace period.  And Discover doesn't have any debit/pin option that I know of, so no concern of cannibalizing their other business.  And happier customers. What is in it for the grocer?  Happier customers, and they need to have the armored car come around less often and spend less time counting drawers internally.