There’s a term used to describe people who walk into a store, help themselves to a sandwich or a cupcake, and then promptly walk out: Shoplifters. But maybe not for much longer. Amazon just lifted the lid on its new Amazon Go technology, which looks to fundamentally transform the retail world. Here’s how it works. You enter a store using Amazon’s propriety technology and flash your personal QR code to a reader. Then, you just pick up what you want and walk out. No dealing with infuriating self-checkout machines or cashiers. The money is automatically taken from a nominated credit...