Why your health expenditures is higher than others?A comparison between a US and a Japanese academic hospital

In some country,the health expenditures is high,however,some are rather low.The reason?Yes, the national health care policy make a difference.Is there any other reason you don’t know?Aresearch list some other factors by contrastive analysis:

To drill down into why per capita health expenditures vary between the US and Japan, this exploratory study compares the price, volume and composition of services provided to inpatients for two procedures in an academic hospital in the US, and one in Japan. 
You can read the full artical to learn the analysis process and results.

Maybe it is not very comprehensive,welcome to complete.