A doctor’s goal is not just to cure disease. It’s to cure disease within the confines of what’s reasonable and tolerable to the patient. Fevers can have marginal benefits in fighting infection, but they hurt. And I go to the doctor to stop hurting. I don’t care about double-blind studies when I’m shivering under a blanket. If you have a pill that can make a fever stop, give it to me now.

It may be rational to want a fever if you have an infection. But it’s not reasonable.

That philosophy—aiming to be reasonable instead of rational—is one more people should consider when making decisions with their money.