This is so well written I thought it worth sharing. What appears below is just an excerpt.
There are two major alternatives to the allocating of health care on the basis of personal wealth. Both involve a large number of individuals agreeing (or having imposed on them) that the amount of health care they receive will not be in strict accord to how much they have paid for it. The cost will be distributed over the healthy as well as the sick, even though the benefit will inure only to those who are ill or who need health care to prevent illness. People accept the certainty of a bearable cost to avoid the risk of an unbearable one. But to the extent that these collective programs sever the connection between paying for health care and receiving it, they generate increased demand for health care. The individual feels that he has already paid for health care. When he is sick, or thinks that he is sick, he feels fully entitled to care with no consideration of cost. After all, he has already paid for it, hasn’t he? Given the limited amount of health care that may be bought with the aggregate funds of the group, this untrammeled demand for it must always result in rationing. This is true whether the collective effort is a private insurance plan or a government program. Rationing is inevitable in all collective health care financing schemes