. . . . . "Using this criterion, Bogota in Colombia has the weakest purchasing power with 97 minutes of work required to buy a Big Mac.Meanwhile, Oslo, London, Copenhagen, Zurich and Tokyo are the most expensive cities to live in worldwide in relation to a standardized basket of 122 goods and services, UBS said.In terms of cost of living, Taipei ranked 40th in the world and seventh in Asia, the bank said.The" . .