This is because the places that people want to go to are these big cities, these prosperous urban centers, which are actually sealed off.
aia aia aia aia aia aia aia aia aia aia aia aia aia aia aia aia aia aia aia aia aia aia aia aia aia aia aia aia aia aia aia aia aia aia aia aia aia aia aia aia aia aia aia aia aia aia aia aia aia aia aia aia aia aia aia aia aia aia aia aia aia aia aia aia aia aia aia aia aia aia aia aia aia aia aia aia aia aia