It could be five to 10 years before the supermarket of the future, as envisioned by designers and marketers, is common. But those experts believe it’s a matter of when, not if. Here's what you might find in the supermarket of the future. (The numbers in the illustration above correspond to the information below.)

1. Easy checkout. In-store sensors connected to a smart­phone app keep track of each item you select. The app runs a tally. It also cross-checks your list or selected recipes to tell you what you forgot. As you exit, the app charges your mobile-payment system.

2. Curbside pickup. Order from your smartphone or computer. A staffer loads your bagged order directly into your car, within your chosen time window. Or you can request home delivery.

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