Article continues below ADVERTISEMENT Until now, supermarkets have stayed tight-lipped about why the reduced-price stickers are always bright yellow. But experts at digital marketing firm Add ...

Until now, supermarkets have stayed tight-lipped about why the reduced-price stickers are always bright yellow. But experts at digital marketing firm Add People say the choice is far from random.

Tesco regularly gives shoppers a chance to pick up discounted food through yellow label stickers. These are typically food items that are due to expire and then marked down in price at the end of ...