Alain Bertaud, Senior Research Scholar at the Urbanization Project, talked to New Zealand's The Press about the challenges facing cities around the world:
Cities are big living entities, which are transferring rural populations into an urban one. People choose to move to cities because they see more opportunity. They need somewhere to live. The challenge is finding accommodation for them because if you don't, you will have to increase salary enormously to compensate for the rent, and then the construction will cost so much that maybe even it will stop."