Reverse discount: If a customer opens the box and then demands takes an unopened one, or if a customer intentionally damages a product (the offenders will be caught on the AI security cameras from a previous wish list) trying to get a discount, they'll get one. A reverse discount. Opened boxes will be charged a reverse discount of 10% added to the purchase price (and they'll be forced to buy the opened product), intentionally damaged merchandise will be charged a 50% reverse discount, and of course the damaged merchandise will have to be purchased with a no return policy. How will we reinforce that you ask? NO RETURNS stamped on the item in the same ink used in permanent markers. In several places.
Change gun: Sick and tired of people paying for a $5 item with a $100 bill first thing in the morning, or using a c-note for something that costs $5 at any time of day. This handy device will show them the error of their ways by showering them (literally) with their change... in change. Pennies, nickels, dimes, quarters will be dumped on them. Simply ask the customer to stand off to the side, hit the hidden switch and the change gun will dump their change on them. Just think of all the fun you'll have watching someone try to get out of the store with $90 in change!
Any way you swipe it: It's an undeinable fact. Some people just have no idea how to swipe their credit/debit/gift cards. This device ends all that, the customer simply holds their card in an infra-red field for a couple of seconds, and the field automatically finds the magneitc strip, and relays all the relevant information to the cash register (except the PIN of course, you may still need to tell the custy to input that), but it will save time of them swiping the card wrong, and hitting cancel instead of enter.
Auto total shopping carts: Multiple sensors placed in the shopping carts will automatically scan the barcode of each item placed in the cart, keeping a running total (plus tax) on the handle of the cart (muliple sensors since the barcodes will never be perfectly lined up). If an item is taken out before checking out, the item will be deducted from the running total. X-ray sensors will also scan each item to make sure nothing is hidden inside something else. How do we prevent customers walking out without paying you may ask? Sensors in the door will lock the wheels on the cart and sound a loud obnoxious alarm if the total is not paid. If customers have their own reusuable bags they can simply bag their items as they go and scan their credit/debit cards via a scanner also built into the cart, or they can go through a regular register paying an additional $1 fee to have the cashier bag everything for them. Going through a regular register will also deactivate the auto locking wheels when leaving.
Just a few more things that should exist in a perfect world.