According to the latest Cost of Living Survey from Mercer. Tokyo is in second position, with Ndjamena in Chad in third place. Moscow is in fourth position followed by Geneva in fifth while Karachi is ranked as the world's least expensive city. The survey found that Luanda is three times as costly as Karachi.

From the survey, London (rank 17) is the UK's most expensive city, followed by Aberdeen (149), Glasgow (155), and Birmingham (158). Belfast (182) is ranked as the UK's least expensive city. There's some great country comparisons below. What can you do with the data?