Heath care is an expensive product, with high demand chasing limited supply. There are only so many doctors, and training new ones requires a long education at great personal expense. Meanwhile, advances in medicine are steadily prolonging life and improving its quality. It follows that if we want to decrease the cost of health care (or, to use the currently popular political vernacular, “improve access”) we need more doctors. Conversely, reducing the supply of doctors would make medical care more expensive, and reduce its quality. If government controls are then applied to skyrocketing costs, shortages and rationing would be the...