Big Mac is bust ...
I left SA for the UK over a year ago, and while food (? is a Big Mac actually classed as food ?) is more expensive than in SA, and property is horrendously more expensive, my standard of living has shot up to way above what it was in SA. ... I bought a car, cash, on 2 months salary (2nd hand, but jolly good ... same car would have taken 7 months of my SA salary in SA). My communications (all types) are laughably cheap. clothes are cheaper, electronics are much cheaper.
My tax is higher here than in SA, I pay a lot of "council" tax (~ Rates and Taxes), my electricity usage is more than in SA [heating bill]. But despite all that, I am more comfortably off, with a larger % of my earnings disposable [meaning I can blow it if I want to!] than in SA.
AND ... for the tax I pay I actually get good roads, good policing, free health care, a brilliant public commuter system.
My point? You CANNOT quantify differences in standard of living or "earning power" with simplistic indexes. What I value, another may hate. What I would happily pay a premium for, another would be horrified to have to pay anything at all. Every single person/family has it's own standard of what is better.
