Walmart's NYC-based innovation center is experimenting with a cashier-less store concept called Project Kepler, which "aims to reimagine the in-store shopping experience with the help of technologies like computer vision," Recode reports.

Project Kepler is in part aimed at creating a store that would feature no checkout lines or cashiers, but use computer vision to detect which products customers leave the store with and then charge their accounts accordingly.

Why it matters: Amazon is also experimenting without cashiers, while roughly 3.5 million Americans operate cash registers for a living.