By Building a Backup CITY!
http://dvice.com/archives/2011/11/japan-wants-to.php
Interesting idea, but kinda "silly". While China is building outer "hubs" for Beijing, building a backup city can be expensive (maintenance alone would be insane)
"hub" - these are cities that are outside of the City. According to my dad, they are planning around 15 or so (but have like 7 I think) which are functional. The problem is that the infrastructure is not as good and doesn't have all the facilities and people STILL go to Beijing for jobs. (note: the city population is around 10 MILLIONS people)
Edit: I know the original article was about Japan, but I mention China cause they are doing something "similar" but instead of backup, they are more of hubs cities.
Edit: correction. 100 millions rural Chinese move to the cities and only 10 million people IN the city.
Edit: in case there was confusion (which is easy for me to do) Japan is trying to build a backup capital city that can house 50k people. I put in China cause they are trying to build fully functional city to help alleviate dense population in their main city. How does this relate? It is all about urban planning and how much do you want to built into the a city? fully functional and working with all the amenaties? or just the basics?
China did with just the basics and per the article below (later post) it shows that the city didn't have enough jobs to keep it "self sustain" and have to go to the main town. I feel that if Japan were to build a city just for "backup" purpose, it will fall under the same trap considering no one will be living there since it is a backup.