French grocery chain Monoprix, owned by the Casino Group, is testing a ‘cash-free’ store in Clichy in a concept said to be inspired by the American online retailer Amazon. According to sources, the new store is internally called Monop’Go and is located near to Monoprix’s head office. To use the store, consumers will reportedly first need to download an app on their smartphone. To buy the items, they are said …