I love this part: “Historically, doctors have been paid for services, not results. In the eighteenth century B.C., Hammurabi’s code instructed that a surgeon be paid ten shekels of silver every time he performed a procedure for a patrician—opening an abscess or treating a cataract with his bronze lancet. It also instructed that if the patient should die or lose an eye, the surgeon’s hands be cut off. Apparently, the Mesopotamian surgeons’ lobby got this results clause dropped. Since then, we’ve generally been paid for what we do, whatever happens.”
 Pink, Daniel H, “Drive: the surprising truth about what motivates us”, Riverhead Books, New York 2009.