“It’s astonishingly difficult for consumers to find any health-care information that would enable them to make informed choices—based not just on price, but on quality of care or the rate of preventable medical errors. Here’s one place where legal requirements might help. But only a few states require institutions to make this sort of information public in a usable form for consumers. So while every city has numerous guidebooks with reviews of schools, restaurants, and spas, the public is frequently deprived of the necessary data to choose hospitals and other providers.”