The goal: Use these real-world store features to lure shoppers back from the internet, and maybe even nudge them to spend more in the process.

Amazon's new experimental grocery store in Seattle, opening in early 2017, will let shoppers buy goods without needing to stop at a checkout line. Sensors track items as shoppers put them into baskets or return them to the shelf. The shopper's Amazon account gets automatically charged.

"Amazon, for good or bad, has been setting the path," said Robert Hetu, research director at Gartner Research. "Each retailer is going to have to respond in some way. But it's not one-size-fits-all."

Kroger, Neiman Marcus and Lowe's are among the companies already experimenting with futuristic retail stores. Robots, for instance, could help guide shoppers to the right aisle, while augmented reality apps could help you see how a particular shade of paint will look in the living room — or how you might look in a pair of jeans.

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