BBC News By Charles Gitonga Published image copyrightPeter Njoroge From detergent to sausages, tissue paper and even sanitary pads, almost everything seems to be on a discount across Carrefour supermarkets in Kenya. In-store, every so often an announcer will come on the address system to entice shoppers with the various deals of the day, ranging from foodstuff to electronics. It is a strategy that has helped the giant French retailer make headway in Kenya's tough retail sector, which is littered with the carcasses of other supermarket chains from far and wide. Since setting up shop in East Africa's biggest economy in 2016, Carrefour has expanded quickly and now runs 13 outlets in the major cities of Nairobi and Mombasa, making it one of the country's biggest foreign supermarket chains.