Glaeser writes, "I don't have anything against Greenwich Village or six-story buildings, but the perspective of the economist pushes strongly against any attempt to postulate or, far worse, regulate a single perfect density.
Indeed, to anyone who respects consumer sovereignty, there is something a little jarring about Jacobs's question: 'What is the proper density for city dwellings?'
Why in the world should there be a 'proper density'? A good case can be made that cities succeed by offering a diverse menu of neighborhoods that cater to a wide range of tastes. Some people love Greenwich Village, and that's great, but I was perfectly happy growing up in a 25-story tower, and I don't see anything wrong with that, either."
Keeping density low causes a reduced supply, and that will basically drive prices up and limit those low-density areas to only the most affluent or prosperous people, according to Glaeser. He says cities need a variety of densities, including high densities.