Recently I've seen the questions come up regarding why the market doesn't respond to health care or why supply and demand don't seem to work in health care as in other economic models.

The answer is simple.  There is no free market nor is there a supply/demand model for health care.

While some might dispute that claim, consider the way the process works.  Supply and demand is based upon the notion that prices will be set based on what the market will bear and consequently supply and demand will rise or fall in response to those prices.  Even though one could argue that such a premise is seriously flawed when it comes to health care anyway, there's another reason why it doesn't work; insurance.

A post on the Science Codex caught my attention (You think of your dog as one of your children? You probably live in the city).

Of course, my first reaction was that this guy clearly lived in the city to have such an opinion.  However on closer reading I realized that I had absolutely no idea what kind of research this represented beyond examining the obvious.

...who found that people who think of animals as children tend to have a city background.