The article explores how competition among grocery stores affects the food market in the Czech Republic. The researchers analyzed data from 2008-2009 to see if a dominant firm creates an oligopoly in the sector. They found that no single chain store dominates the market, but Schwarz (Kaufland, Lidl) is the top player with a quarter of total revenues. Despite no clear dominance, there is a possibility of companies colluding on prices or engaging in duopoly reactions.