Joe Feldman

The average Walmart supercenter is nearly 180,000 square feet, bigger than three football fields.

The average Walmart supercenter is nearly 180,000 square feet, bigger than three football fields.

And it carries something like 120,000 items, each with its own price.

And it carries something like 120,000 items, each with its own price.

Joe Feldman is a retail analyst at Telsey Advisory Group.

Joe Feldman is a retail analyst at Telsey Advisory Group.

Electronic price labels replace manual labor with the click of a button.

Electronic price labels replace manual labor with the click of a button.

And Feldman says there are other time-saving advantages.

And Feldman says there are other time-saving advantages.

Workers can use an app to identify shelves that need attention.

Workers can use an app to identify shelves that need attention.

Electronic prices will allow Walmart to not just change prices more easily, but whenever it wants.

Electronic prices will allow Walmart to not just change prices more easily, but whenever it wants.

The company says it will only do this outside of shopping hours.

The company says it will only do this outside of shopping hours.

So the cost of toothpaste can't go up between when you grab it from the shelf and when you check out.

So the cost of toothpaste can't go up between when you grab it from the shelf and when you check out.

Still, Phil Lempert, a food industry analyst, says commodities like eggs, meat and coffee fluctuate daily.

Still, Phil Lempert, a food industry analyst, says commodities like eggs, meat and coffee fluctuate daily.