I am not sure we can make cities that are great to live in beyond a certain size. I don't know about the US, but in Europe smaller cities (less than one million

I am not sure we can make cities that are great to live in beyond a certain size. I don't know about the US, but in Europe smaller cities (less than one million citizen) do not have the systemic problems than larger cities have. However, economic activity draws people and companies in, which generates more activity. We end up with over-populated cities like Paris, and the issues that come with them: ever-increasing housing prices, large suburbs, long commutes. So I wonder if the main issue is really cities, or how to find a way to go from large monolithic cities to several reasonably-sized cities that cooperate. The technologies involved being transportation, remote work tools, etc. Also, when I think about cities I like in Europe, an interesting point is that they are often built on the seashore (Lisbon, Copenhagen, Stockholm, Nice...).