Once again asking about "expats", which just means "rich immigrant". You could get totally different answers if you were asking for "main immigrant part of $CITY". The survey to collect data even says "Do not enter prices that can only be found .. in [e]specially cheap neighborhoods", which usually means "immigrant".
Rich expats are pretty much by definition not "immigrants", they're usually visiting for a few years with a fat "expat package" courtesy of the company. But these are increasingly a dying breed, and most expats are neither fat cat expats nor dirt-poor refugees, but somewhere in the middle.
Also, much of the calculator asks for things like a liter of gas or a bottle of Coke, whose price is not going change radically no matter where you shop.
Also, much of the calculator asks for things like a liter of gas or a bottle of Coke, whose price is not going change radically no matter where you shop.
Not necessarily. There is a Big Mac Index[1], that looks at the price of a Big Mac from McDonalds, which shows that the price of a very standard product (a Big Mac) can vary by location.