Why do other rich nations spend so much less on healthcare?

Why does the United States spend so much more than other wealthy nations? The biggest reason is that U.S. healthcare delivers a more expensive mix of services. For example, a much larger proportion of physician visits in the U.S. are to specialists who get higher fees and usually order more high-tech diagnostic and therapeutic procedures than primary care physicians. Compared with the average OECD country, the U.S. delivers (population adjusted) almost three times as many mammograms, two-and-a-half times the number of MRI scans, and 31 percent more C-sections.