Retail stores are heading in that direction too. According to M.V. Greene, writing in Stores, a trade magazine for retailers:

The “Internet of Things,” where objects in the physical world are connected to electronic virtual networks, is poised to turn retail on its head. Not since the introduction of online shopping – and before that credit and debit cards for purchasing – has something in retail had the potential to be so transformative.

Usually, when we think of “transformative” changes, we’re talking about things most people didn’t even anticipate coming at the time: examples include the radio, the atomic bomb, the Internet. But this coming change in our retail experience is, I would guess, something that many people wouldn’t find all that surprising. After all, the history of retail shopping is one of task-shifting.

In the last century, the big change in retail checkout came by having the customer do more of the work. In the original model of, say, the grocery store, a person went into a general store, where the owner or clerk stood behind a counter and retrieved items the customer wanted from behind-counter shelves, then packaged those items and billed the customer or accepted payment. But that retail model was gradually replaced by the “supermarket” model, which put products out on customer-accessible shelves. Now, the customer did the work of selecting items he or she wanted and taking them to a cashier for payment. Efficiencies galore.

More recently, efficiencies have built on that model of having the customer do more of the work, now augmented by technology. For example, a growing number of grocery chains have “intelligent” carts that can total up items as a customer moves through the store, tracking movement and making recommendations. And in many stores, especially grocery and drug-store chains, customers can use self-checkout kiosks. In Apple stores, for a couple of years already, you’ve been able to buy off-the-shelf items using an app on your smartphone and walk out of the store with your merchandise, having never interacted with a salesperson.

But just because the coming changes in retail checkout aren’t beyond our imagining doesn’t mean that they’re unimportant. For one thing, they’re likely to have profound effects on retail employment. In fact, according to data from The Economist, retail workers are among those whose jobs are most likely to be displaced by digital or computer-related technologies in the next 20 years. (I should note that the U.S. Bureau of Labor Statistics holds a different view, projecting that growth in the number of retail-sales jobs is likely to hold steady—at about 10 percent—over the next decade. Your guess as to who is right may be better than mine, but I’m putting my money with the folks at The Economist.)

Apart from employment concerns, the vision of a digitally-automated retail future provokes unease about privacy issues. As M.V. Greene notes, “a major hurdle for brands and retailers is to gain the trust of consumers when their personal data is flying back and forth in real-time across networks.” Greene quotes David Dorf, a Senior Director of Technology Strategy at Oracle Retail, who says retailers have to be worried about a “creepiness factor” related to the privacy of consumer data.