For being one of the richest countries in the world the median income is way too low (especially for single-households). And a direct comparison with other countries can't be done without factoring in all the taxes we have in addition to payroll tax. Norway is also one of the most expensive countries in the world. We have 25% VAT on most goods and services. 15% for food and drink. Alcohol is heavily taxed, for high alc/vol 65% of the purchase price is taxes. Vehicles are heavily taxed, compared to, i.e., Sweden. A $50k car in the U.S. would be $100k here, or more, depending on engine size, emissions, etc. High environmental taxes for fuel, electricity, etc. Taxes on gifts, inheritance, property, wealth, pension, etc.

http://www.skatteetaten.no/en/Rates/Value-added-tax/