Yes, it's from the New Yorker, so I'm sure Kevin will appreciate it. Regardless, this article on health care is worth a read:

If doctors wield the pen, why do they do it so differently from one place to another? Brenda Sirovich, another Dartmouth researcher, published a study last year that provided an important clue. She and her team surveyed some eight hundred primary-care physicians from high-cost cities (such as Las Vegas and New York), low-cost cities (such as Sacramento and Boise), and others in between. The researchers asked the physicians specifically how they would handle a variety of patient cases. It turned out that differences in decision-making emerged in only some kinds of cases. In situations in which the right thing to do was well established—for example, whether to recommend a mammogram for a fifty-year-old woman (the answer is yes)—physicians in high- and low-cost cities made the same decisions. But, in cases in which the science was unclear, some physicians pursued the maximum possible amount of testing and procedures; some pursued the minimum. And which kind of doctor they were depended on where they came from.

You should start at the beginning and read it all.