In 1827, American anarchist Josiah Warren opened a store (Cincinnati Time Store) in which goods were sold basically at cost (with a 4-7% mark-up), and customers were given labor notes with their purchases that bound them to give Warren as much of their time as they spent shopping in his store. A standard price was one working hour for 5 kilos of grain. Also, people could pay for services from other people in this store leaving notes on an advertising board.