The online marketer Amazon is opening a new kind of store. It is one where people do not have to wait in long lines to buy a product. Instead, the buyers pay using their smartphones. The new store is in the American city of Seattle, Washington. It is called Amazon Go. It sells products that are normally found in a grocery store. What you will not find, however, are long lines and cashiers exchanging money. Customers must have a smartphone, an Amazon account, and a program on their smartphone: the Amazon Go app. The app makes a list of everything that customers plan to buy from the store. After customers have finished shopping, they can simply leave. Amazon says that because its new store does not require as many employees, the prices of goods will remain low. The company has been working on creating the store for four years.