The site is the product of the guy’s blog, where he writes about creating passive (i.e. investment/savings) income and using that to retire (as in only work if you want to) abroad. The general rule of investment income is that you can withdraw about 4%/yr or 1/300th per month without it vaporizing on you over the long term.
He doesn’t go much into explaining it on the linked site, but the logic is that if you can save enough to get $X/month in passive income, you could live a lean/modest/opulent life in Y city without having to work unless you want to.
So far I can apparently live in a couple of places I really don’t want to live (Hyderabad, e.g.) but I can see the appeal of tracking where you might be able to live if your job goes up in smoke tomorrow and you don’t really want to get another one… Mangalore looks like a nice enough place to live, (based on my total ignorance of the place).
