Suppose there are ten people. Person one has 1$ in free money, person two has 2$ in free money, and so on, so person ten has 10$ in free money.
Let us then assume there is soap (a good for which it can be assumed that everyone wants it), but there are only seven bars of it. All ten people want soap, but only seven will get it—so how do you determine which seven?
The way a market would determine—this example being both contrived and overly simple, admittedly—is to set the price of the soap such that only seven of the people can purchase it. For example, each bar of soap would be 4$. The bottom three people cannot buy it, even though they want it.
But now, suppose people want everyone to have soap. Some might claim it’s even a human right to have soap (though this right didn’t exist prior to there being soap)! The question then becomes: how do we guarantee that everyone has soap?
“Aha!” go some politicians. “Since the price of soap is 4$ a bar, all we need to do is give people money so they can afford it!” So they give everyone 3$, which means that everyone can afford it. But there are still only seven bars—so the price of soap goes up to 7$ to compensate. That person who had 6$ (and so was decidedly middle-class) was previously spending 66% of their income on soap. Now, they are spending 77%.
Of course, that 3$ given actually has to come from somewhere, so let’s take 3$ from each of the top three people, and give it to the bottom three. So now our money range is: 4,5,6,4,5,6,7,5,6,7. But we still only have seven bars of soap! The price would then probably become 5$—enough for eight people to afford it, which means that one gets short-shafted. Or it might be 5.50$, so some people have to sell off family heirlooms to get that extra half-dollar.
Alternatively, the politicians could simply regulate the price, and make soap cost one dollar. There are still only seven bars of soap, so that means that we have a shortage of soap, since only seven people (out of ten) have it—even though everyone can afford it!
The real problem here is that there are only seven bars of soap; if we had ten bars, there would be no issue whatsoever. The price would probably be 1$ (the price enforced by the government), so everyone could afford it, and there would be no shortages. The question then becomes: why are there only seven bars? Is it possible to produce more?
In the case of soap, yes, there is. However, that’s about the point where they find out that the government limits the number of bars of soap that can be made. So the government is trying to solve that which is already the cause of the government, and people still lose out.
How do you make sure everyone can afford soap? Get rid of government caps on the amount of soap that can be produced—then you produce enough soap so that everyone can have a bar (I didn’t discuss sharing for simplicity). Once you reach that point, you might either get a soap monopoly that still overcharges, or you might get a competitive marketplace that pushes the cost of soap down to 1$ a bar—but at least you have enough soap for everyone.
By the way, if you replace “soap” with “medical care”, and “bar” with “doctor”, you have a grossly over-simplified view of healthcare in the United States. (Yes, the situation is far more complicated than the AMA intentionally limiting and reducing the number of doctors—that’s why I said “grossly over-simplified”.) So maybe we ought to stop talking about health insurance, and start talking about why medical care is so expensive in the first place. Might it be because of a lack of supply?