Thank you for the opportunity to help you with your question!
A key aspect between pay and benefits in each of the countries listed compared to the United States is the exchange rates of the country's currency or money. There are also laws when it comes to the work compensations of people in each industry in a country. There is also the idea of what kinds of education that a person would need in order to make a certain income in a particular country and so one of the impression I got from doing the research is the laws the govern what is needed to work in the country and the exchange rates of the country as well.
Please let me know if you need any clarification. I'm always happy to answer your questions.