5. San Francisco, US

San Francisco, California — with the Silicon Valley tech hub on its door steep — is one of the world’s most expensive cities to live and work in, but for good reason.
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Silicon Valley attracts businesses through its high further education rate, strong GDP per capita and high concentration of well-known, successful tech startups.
Uber, Salesforce, and Wells Fargo are some of the companies that call the city home.
