Full bibliography

Average Monthly Disposable Salary (After Tax). Based on 0-50 contributions for Afghanistan, Aland Islands, Andorra and 81 more countries and 50-100 contributions for Albania, Algeria, Armenia and 19 more countries and over 100 contributions for Argentina, Australia, Austria and 82 more countries. The surveys were conducted by numbeo.com from May, 2011 to February, 2014. See this <a href="http://www.numbeo.com/common/form.jsp?country=United+States&amp;current=8">sample survey for the United States</a>, respondents were asked "Average Monthly Disposable Salary (After Tax)". Prices in current USD.