But health insurance is different from every other type of insurance. Health insurance is the primary payment mechanism not just for expenses that are unexpected and large, but for nearly all health-care expenses. We’ve become so used to health insurance that we don’t realize how absurd that is. We can’t imagine paying for gas with our auto-insurance policy, or for our electric bills with our homeowners insurance, but we all assume that our regular checkups and dental cleanings will be covered at least partially by insurance. Most pregnancies are planned, and deliveries are predictable many months in advance, yet they’re financed the same way we finance fixing a car after a wreck—through an insurance claim.

Comprehensive health insurance is such an ingrained element of our thinking, we forget that its rise to dominance is relatively recent. Modern group health insurance was introduced in 1929, and employer-based insurance began to blossom during World War II, when wage freezes prompted employers to expand other benefits as a way of attracting workers. Still, as late as 1954, only a minority of Americans had health insurance. That’s when Congress passed a law making employer contributions to employee health plans tax-deductible without making the resulting benefits taxable to employees. This seemingly minor tax benefit not only encouraged the spread of catastrophic insurance, but had the accidental effect of making employer-funded health insurance the most affordable option (after taxes) for financing pretty much any type of health care. There was nothing natural or inevitable about the way our system developed: employer-based, comprehensive insurance crowded out alternative methods of paying for health-care expenses only because of a poorly considered tax benefit passed half a century ago.

In designing Medicare and Medicaid in 1965, the government essentially adopted this comprehensive-insurance model for its own spending, and by the next year had enrolled nearly 12 percent of the population. And it is no coinci#dence that the great inflation in health-care costs began soon after. We all believe we need comprehensive health insurance because the cost of care—even routine care—appears too high to bear on our own. But the use of insurance to fund virtually all care is itself a major cause of health care’s high expense.

Insurance is probably the most complex, costly, and distortional method of financing any activity; that’s why it is otherwise used to fund only rare, unexpected, and large costs. Imagine sending your weekly grocery bill to an insurance clerk for review, and having the grocer reimbursed by the insurer to whom you’ve paid your share. An expensive and wasteful absurdity, no?

Is this really a big problem for our health-care system? Well, for every two doctors in the U.S., there is now one health-insurance employee—more than 470,000 in total. In 2006, it cost almost $500 per person just to administer health insurance. Much of this enormous cost would simply disappear if we paid routine and predictable health-care expenditures the way we pay for everything else—by ourselves.