World's most expensive cities to live in
https://edition.cnn.com/travel/article/worlds-most-expensive-cities-2019/index.html
The survey must consider average income around each city in addition to the cost of the items.
Especially, almost all the cities ranked between 1st and 10th are in the countries where average income is relatively high.
So, fair comparison would be the value of the cost of the items divided by average income.