Meat from the butcher, bread from the bakery, vegetables from the greengrocer - fresh food, personal service, but very time-consuming. This is what shopping looked like until the birth of the supermarket. After some initial difficulties, the new shopping experience got an unexpected boost due to the Great Depression of the 1930s. Today, supermarkets are an indispensable part of our daily lives. Great Inventions explores the link between the history of the supermarket and that of the car and highlights other inventions that have made large shops big business.