Yeah, as others have pointed out… by locking up very expensive products. The iPad I just bought there wasn’t even on the floor—they wouldn’t get out of the locked back room to give it to me until I’d already paid for it. And then checked my receipt on the way out.
(I will add they also failed to enroll the AppleCare I paid over a hundred bucks for in spite of all that, so if I had been more ignorant and not caught that later and gone back to complain, I’d have gotten severely ripped off.)
So yeah, if Costco is our standard, the obvious solution is to make people pay first and then give them the product out of a locked room, then check again when the leave the building. Works wonders!
Not to mention that they put small things in absurdly large packages—if I want to buy an SD card or phone charger there, it has more cardboard and plastic than if I had Amazon ship it to me in a box. I shudder to think of the monstrous levels of waste that would result if every retailer did that, and it basically prevents them from selling anything physically small that costs less than $10.