The general theme of the book “Overtreated,” the New York Times’ pick for best economics book of the year, is that we can cut a significant percentage of our health care costs—”between one fifth and one third,” says the author—and not have any impact on our level of health. As a nation, we tend to err on the side of too much treatment, exposing ourselves to unnecessary risks and racking up fees on procedures we could do without. And since doctors depend on a piecemeal approach to earning income, while at the same time dealing with significant financial risks from malpractice suits, they tend to push for more treatment, not less (they need to earn a living while also protecting themselves from accusations of doing too little).