Streets also tend to aggregate establishments of similar nature and character. East 9th Street in Manhattan, for example, offers a cluster of Japanese restaurants, clothing stores, and cultural venues. In Washington, D.C., 17th Street and P Street are well known as epicenters of the city's (relatively small) gay culture. Many cities have a Radio Row or Restaurant Row. Like in Philadelphia there is a small street called Jewelers' row giving the identity of a "Diamond district". This phenomenon is the subject of urban location theory in economics. In Cleveland, Ohio, East 4th Street has become restaurant row for Cleveland. On East 4th is Michael Symon's Lola Bistro and other restaurants.