How costly Oslo is?

Oslo was the costliest city in the world in 2006, even more than Tokyo. Lets see some example: As of today's newspaper (29.01.07), average price of a house (if you wanna buy one) per square meter cost 5400 USD (34000 NOK) in Oslo, only one ride (even it is about a km) to bus cost 4USD (25NOK), a single student (remember student) room with attached kitchen + toilet (my one) rents 500USD/month, If i want to go to Oslo from my city, Lilletsrøm 11 min travel of local train the up-down travel for one time cost about 12 USD.