Immediate Pain Teaches Behavior Just as we are more likely to repeat an experience when the ending is satisfying, we are also more likely to avoid an experience when the ending is painful. Pain is an effective teacher. If a failure is painful, it gets fixed. If a failure is relatively painless, it gets ignored. The more immediate and more costly a mistake is, the faster you will learn from it. The threat of a bad review forces a plumber to be good at his job. The possibility of a customer never returning makes restaurants create good food. The cost of cutting the wrong blood vessel makes a surgeon master human anatomy and cut carefully. When the consequences are severe, people learn quickly. The more immediate the pain, the less likely the behavior. If you want to prevent bad habits and eliminate unhealthy behaviors, then adding an instant cost to the action is a great way to reduce their odds. We repeat bad habits because they serve us in some way, and that makes them hard to abandon. The best way I know to overcome this predicament is to increase the speed of the punishment associated with the behavior. There can't be a gap between the action and the consequences. As soon as actions incur an immediate consequence, behavior begins to change. Customers pay their bills on time when they are charged a late fee. Students show up to class when their grade is linked to attendance. We'll jump through a lot of hoops to avoid a little bit of immediate pain. There is, of course, a limit to this. If you're going to rely on punishment to change behavior, then the strength of the punishment must match the relative strength of the behavior it is trying to correct. To be productive, the cost of procrastination must be greater than the cost of action. To be healthy, the cost of laziness must be greater than the cost of exercise. Getting fined for smoking in a restaurant or failing to recycle adds consequence to an action. Behavior only shifts if the punishment is painful enough and reliably enforced.