The Great American cities7&8

Jacobs' argument in Chapter 7&8 are the generators of diversity and the need for mixed primary uses. In her opinions, she thought there are four conditions indispensable. The first thing is district, internal parts as possible, must serve more than one primary function, and then most blocks must be short; that is, streets and opportunities to turn corners must be frequent; Next, the district must mingle buildings that vary in age and condition. Finally, There must be sufficiently dense concentration of people, for whatever purposes they may be there. In these two chapters she collects and explains all of ideas by those four conditions. In combination, these conditions create effective economic pools of use.