Tesco is the largest British supermarket chain, and the fourth largest in the world. Jack Cohen , the son of a tailor , opened a grocery store in London in 1919. He opened his first supermarket in 1956 and the first superstore in 1968. the supermarkets sell groceries, clothes, electrical goods, financial services, music and music downloads , furniture,and internet and telephone services. It aims to appeal to all types of customers - upmarket and downmarket . It has shops in countries including the Czech Republic Ireland Japan Poland Slovakia and Thailand. In 2005-2006 It's revenue was 38.3 billion and It's profits were over 2 billion