Editor
The success of Costco’s business model relies on rigor. The wholesale retailer, which uses a membership system, strictly monitors entrances and exits and double checks customer receipts.
But for friends and relatives of members, there was a well-known hack for scoring Costco’s low prices without paying an annual fee: the self-checkout lanes. Some users found they could borrow a member’s card, or a member’s QR code from the Costco app,…
