A: Overcrowded places have a lot of problems, don´t they?
B: Sure. Traffic jams, pollution, noise...
A: Traffic jam is the most serious problem, isn´t it?
B: Not really. We can see homeless people in many places in big cities, can´t we? The city cannot build enough houses for all of its people.
A: So they live wherever they can, under a bridge, in a deserted house...
B: Yes, and some of them become criminals.
A: This shortage of accommodation is not easy to solve, is it?
B: No, it isn´t.