...We live in a world of scarcity, which is to say that at any moment our ends surpass the available means to achieve them. We can't have everything now. Thus we have to choose among alternatives. It is obvious that the human race has pushed back the limits of scarcity, but that is the result of human ingenuity sufficiently free to solve problems, or what Julian Simon called "the ultimate resource." Nevertheless, right now we cannot have all we want, so we have to make choices. A quantity of a resource or a unit of labor services cannot be put to more than one purpose at a time. Making choices entails opportunity costs—the benefit we forgo by choosing alternative A over alternative B instead.
Despite the popular misconception, health care is not beyond economic law; it is not a free good that falls like manna from heaven. It has to be produced, which means people must mix their scarce labor with scarce resources to produce the things used to perform the medical services we want. It would be foolish to expect them to donate their labor and resources because other people need them. They have their own lives to live and livelihoods to earn. It would be wrong to compel them. They are not slaves.
In other words, no one can have a right to medical care or insurance, that is, to the labor services and resources of other people—including the taxpayers. We hear a great deal about the need to respect all people; well, respecting people must include respecting their liberty and justly acquired possessions. Without that, "respect" is hollow.
...Natural rights—which boil down to the single right not to be aggressed against—require only that one abstain from aggression. Thus all can exercise their rights at once without conflict. On the other hand, government-invented "rights"—such as the right to medical care—cannot be exercised at the same time; the potential for conflict is built in. For example, a person cannot use his own money as he wishes if the government health care system takes it by force through taxation to pay for other people's services....