Prices & Earnings 2015: UBS, the Swiss bank, on Thursday released the 16th edition of the triennial UBS Prices and Earnings study (microsite), which examines prices, wages and earners’ purchasing power in 71 cities worldwide. While Zurich is the most expensive city, workers in the city can buy an iPhone 6 after 21 hours of work; in Kiev, capital of Ukraine, it takes 30 times longer.