“Measuring Health Care Expenditure and Trends” expenditure differ between accountants and economists,

According to chapter 8 “Measuring Health Care Expenditure and Trends” expenditure differ between accountants and economists, outline the differences between the two entities and point where the major differences are.
The healthcare system in the U.S differ from any other country around the world, pick at least two different systems/countries and compare and contrast the differences. How do we rate in comparisons to those other programs, please be specific.
In your opinion what major challenges face the healthcare industry today? Can we overcome based on our current system? If so how and if not what can we do to correct.