This worked brilliantly when the overall market for smartphones was growing, and the richest cities, with the largest number of tech-aware consumers, were booming.

这在当时手机市场持续增长，以及拥有大量科技发烧消费者的大城市蓬勃发展的大背景下运作的很好。

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Indeed, spending among the richest residents in these cities surged in 2009.

事实上，这些城市中的富裕阶层所造成的消费在2009年时大幅上升。

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They are symbols of Buenos Aires' 1880-1930 golden age, when it was one of the world's richest cities.

BBC: The Recoleta Cemetery: Silent theatre and city of the dead

Bandits or no, St Petersburg is in practical terms one of the richest and best-governed cities in Russia: admittedly no great boast.

ECONOMIST: Russia

Not all of the most unequal cities are the richest.

FORBES: Incomes