When people know that candy bars can be too tempting, they can prefer to work in places without candy bar machines. Similarly, people who find ice cream or cookie stands too tempting can stay away from shopping malls that allow such stands. People who find the sight of naked people too tempting can choose to work and shop in places that do not allow people to walk around naked. Economists have worked out models of many of these situations, and the keep coming back to the conclusion that giving people mechanisms of self-control is good enough, unless people are biased to to underestimate their self-control problems. And so recommendations for more self-control regulation tend to be based on claims that we are biased to underestimate our problem.