Most people are healthy most of the time, and as a consequence, health care expenditures are heavily concentrated in a small share of the population: about 50 percent of the health care spending in a given year by those below age 65 is attributable to just 5 percent of the nonelderly population. The lowest spending half of the population accounts for only about 3.5 percent of health care spending in a year.
Deciding how much of total health care expenditures should be shared across the population and how to share it is the fundamental conundrum of health care policy. There is more risk pooling the larger the share of health expenditures included in the insurance as covered expenses (i.e., the fewer benefits excluded and the lower the out-of-pocket cost requirements), the larger the number of both the healthy and the sick insured, and the lower the variation in premiums across different enrollees. Sharing the costs of the sick across the broader population (a.k.a., risk pooling) increases costs for the healthy to the benefit of those with health problems; this creates more financial losers than winners at a point in time, since there are many more healthy people than sick in a given year. Segmenting risk pools has the opposite effect, savings for the currently healthy while increasing costs for those with health problems.
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