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by rmc 4365 days ago
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.

[1] https://en.wikipedia.org/wiki/Big_Mac_Index