Imagine you are a well intentioned urban planner for a large city.

You have been asked by the city to choose a location for a housing project.

You can either choose:

Land closer to the center of the city. It is more expensive, but residents would be closer to schools, pubic transport, and other services.

OR

Cheaper land at the outskirts of the city. You intend to provide schools, public transport, and other services.