These are the most expensive, and cheapest, cities to live in if you're an expat

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• A new study by Mercer ranked 226 cities in the world based on how expensive they are to live in.
• Four of the most expensive cities are in just one country. 
• One Canadian city ranked highest for finding the balance between cost and quality of living. 

Some expats seek a better quality of life in a cheaper city; others follow a dream job posting to an expensive metropolitan hub.

But whatever the reason, finding the sweet spot between...