Several years ago, I waited 45 minutes in the queue just to buy a simple beverage and I thought whether we really need cashiers in retailers, or not. I knew the answer was no. In my opinion, it was possible to walk in, grab whatever you like and leave with a self-checkout system. However, because of the lack of technical knowledge, I could not come up with a brilliant idea. The only idea came to my mind was RFID (Radio-frequency identification) tags. The idea was simple; tag every product with RFID tags (like we see on books or DVDs) that will enable customers to scan each product with their smartphone –Near Field Communication (NFC) technology is standard for most of the smartphones today- and add the products to their cart and pay online.