The document compares the prices of 11 common food products sold by 4 major supermarkets (Billa, Carrefour Market, Mega Image, and Profi) in September 2017. It finds that Mega Image had the lowest average prices at 20.04 RON, while Profi had the highest at 50.29 RON. The document also analyzes differences in prices between supermarkets for individual products like bottled water, flour, sunflower oil, rice, and more. It concludes that if Mega Image promoted all 11 products at their minimum average prices from 2016, they would have had the best overall offer of 65.22 RON.