UBS 2012 ranks Oslo the world's most expensive city. - According to the latest study by the Swiss bank UBS on purchasing power in the different towns and cities of the world, Oslo is today the most expensive city worldwide, while Zurich is at the head of the global ranking for gross salary levels. The 15th edition of “Prices and Earnings” - the 2012 edition - studies 72 towns in 58 countries throughout the world. The analysis compares purchasing power with the help of detailed...