This surprised me.

Probably in no other area, notes Burtless, is spending so equal -- not in housing, clothes, transportation or anything. Why? One reason: government already insures more than a quarter of the population, including many poor. Medicare covers the elderly; Medicaid, many of the poor and their children; SCHIP (State Children's Health Insurance Program), more children. Another reason stems from the skewing of health spending toward the very sick; 10 percent of patients account for two-thirds of spending. Regardless of income, people get thrust onto a conveyor belt of costly care: long hospital stays, many tests, therapies and surgeries.

That includes the uninsured. In 2008, their care will cost about $86 billion, estimates a study for the Kaiser Family Foundation. The uninsured pay about $30 billion themselves; the rest is uncompensated. Of course, no sane person wants to be without health insurance, and the uninsured receive less care and, by some studies, suffer abnormally high death rates. But other studies suggest only minor disadvantages for the uninsured. One study compared the insured and uninsured after the onset of a chronic illness -- say, heart disease or diabetes. Outcomes differed little. After about six months, 20.4 percent of the insured and 20.9 percent of the uninsured judged themselves "better"; 32.2 percent of the insured and 35.2 percent of the uninsured rated themselves "worse." The rest saw no change.