The average person living in Seoul has to work 28 minutes to earn the money for a Big Mac, while the average person in Tokyo, Los Angeles or Chicago only has to work 10 minutes and the average person in Nairobi three hours.
The Big Mac is sold by the global fast-food chain McDonald's.
The UBS Investment Bank recently released a report on the cost of living and average incomes of the world's major cities, comparing how much people earn in each country with the price of Big Macs there.
The most expensive places to live, according to the report, were Oslo, Hong Kong, Tokyo, New York and Zurich. Seoul, at 22nd, had similar living costs to Berlin and Amsterdam.
Labor costs were highest in Zurich and Copenhagen, while Seoul ranked 35th. Rent was highest in London, where a three-room apartment costs $7,500 per month. Monthly rent cost about $2,090 in Seoul.