As a very rough guide, charts like this are OK.
But as one intelligent contributor noted, with some effort and shopping around you can live in the most expensive place as cheaply as in the cheapest places listed. Conversely you can spend as much "living high" in a cheap place like India as spending like a Billionaire in high priced Switzerland. I personally had lunch once in the best hotel in India for $200- I also had a lunch (though it was only a bowl of Ramen) in Monaco for $3-. Bottom Line is: Your cost of living depends more on your lifestyle than where you live.