Imagine signing up for a diet plan, and one of three meal plans is already checked off by default. You might stick with that even if another fits you better! That’s because our brains often go for the pre-set option. Or picture choosing your retirement savings plan: one option is chosen for you unless you pick a different one. Many people just stay with it, even if another plan would earn more. What’s going on in our heads? Take the quiz to find out what’s really happening here.