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Death spiral is a condition of the insurance market in which costs rapidly increase as a result of changes in the covered population. It is the result of adverse selection in insurance policies where lower risk policy holders choose to change policies or be uninsured. The term is found in the academic literature at least as early as Cutler and Zeckhauser's 1998 paper "Adverse Selection in Health Insurance" which refers explicitly to an "adverse selection death spiral". ==Health Insurance Spiral== When one purchases an individual health insurance policy, one is assigned to a risk pool “group” specifically for subscribers to that policy. The group is not everyone who holds a similar policy issued by the company, rather only a very small portion of subscribers who hold similar policies. A group is typically only open for a set enrollment period, after which it is closed to any new subscribers. The group size never increases after it is closed. It does decrease, however. Over time, the policyholders in the group acquire health conditions. Hence, the claims costs for the entire group increase, and therefore, so does the average health cost for the individuals in the group. The insurer then raises the rates to cover the higher costs. Subscribers with better health realize that they can re-apply for and obtain other very similar health insurance at low, new-subscriber rates similar to the original rates of the current policy. Often, the insurer will promote the "new" similar health plans. When one applies for the "new" policy, one's health will be reevaluated, one will have to re-qualify and be re-underwritten. However, if one has acquired certain health conditions over the term of the current policy, most likely one will be disqualified for the "new" policy. Or one will be offered the “new” policy at the lower, new-subscriber rate; but acquired health conditions will be excluded from coverage under the "new" policy, even if those health conditions were acquired while covered by the insurance provider under the current policy. Since they can purchase the same or better coverage for less, the healthy people flee the group. As the remaining less-healthy people who cannot flee (because they cannot qualify for new health insurance) acquire more health conditions over time, and since the group is closed to new healthy subscribers, the total health costs for the group accelerates out of proportion to the number of subscribers in the group, and the average cost for the individual group member increases. Premiums are increased to reflect higher average costs of the group. As the premiums increase, healthy people increasingly flee, unhealthy people remain, average costs increase, the cycle continues and the premiums are further increased. This cycle continues until no one, not even the sick who may strongly want or need it, can afford the policy. The individual health insurance policy group then goes out of existence. Since the original size of the group was small in relation to the total subscriber base, it is very easy for an insurer to eliminate, or allow to go out of existence, any one group of policyholders. Other insurance types do not experience the death spiral presumably because they are much more affordable. Catastrophic health insurance would probably not experience the death spiral. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Death spiral (insurance)」の詳細全文を読む スポンサード リンク
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