Some people may think that once you've studied one city, you've studied them all. which is an example of why these people may be misinformed?

I believe the answer is:. The banlieues, or suburbs, of Paris are the bad parts of town, almost inside-out compared to Baltimore.

Those facts reflect different environmental situations even if they belong in a same city. This situation indicates that things such as the economy, culture, and type of government could played a huge factors in determining the character of each part of the city.