The familiar sight of brightly coloured printed prices on supermarket shelves could soon be a thing of the past as big-name retailers weigh up going digital. Not only have some Carrefour and Lidl outlets in Europe switched over to using electronic or digital labels, but across the Atlantic Ocean, Walmart, the world’s biggest retailer, is to install the technology in 2,300 of its US outlets in a move that could sway more of the industry to follow suit. Walmart’s management believes the change will not only mean “an even better shopping experience” but will reduce the need for staff “to walk aro…