Cities bring people together in what become very crowded spaces. They help employees connect with employers and, as important, help customers and clients connect with the suppliers of the important services they choose, who also benefit from serving them. Physicians are helped to connect with patients. Lawyers, accountants and consultants of great variety can connect with clients who rely on their skills and experience, for which they are willingly paid and make practice possible. Restaurateurs connect with the many they feed, and artists connect with the audiences they may only find in a large city. Cities offer valuable choices to all their citizens, rich and poor and those in-between, that are not available outside. We complement each other and combine to ensure our crowded space serves our purpose to connect well. We establish and maintain a grid to deliver essential services — water, energy, roads and other forms of transport — much more cost effectively than if we had to do it...

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