We live in a world of imperfect and costly information, and people seek to economize on information costs in a variety of ways. If we don’t take that fact into account, we risk misidentifying and confusing one type of human behavior with another. Let’s look at it.

Pima Indians of Arizona have the world’s highest diabetes rates. With knowledge that his patient is a Pima Indian, it would probably be a best practice for a physician to order more thorough blood glucose tests to screen for diabetes.