 The other above-mentioned strategy that is often useful for dealing with certain dynamic choice problems is the arrangement of external incentives that make it worthwhile for one’s future self to cooperate with one’s current plans. This strategy can be particularly useful in dealing with discounting-induced preference reversals. Consider again the agent who wants to save for a decent retirement but, as each opportunity to save approaches, prefers to spend her potential retirement contribution on just one more trivial indulgence before finally tightening her belt for the sake of the future satisfaction she feels is essential to her well-being. If this agent’s plans are consistently thwarted by her discounting-induced preference reversals, she might come to the conclusion that she will never manage to save for a decent retirement if she doesn’t supplement her plans with incentives that will prevent the preference reversals that are causing her so much trouble. If she is lucky, she may find an existing precommitment device that she can take advantage of. Suppose, for example, that she can sign up for a program at work that, starting in a month, automatically deposits a portion of her pay into a retirement fund. If she cannot remove deposited funds without a significant penalty, and if she must provide a month’s notice to discontinue her participation in the program, signing up for the program might change the cost-and-reward structure of spending her potential retirement contributions on trivial indulgences enough to make this option consistently dispreferred. If no ready-made precommitment device is available, she might be able to create a suitable one herself. If, for example, she is highly averse to breaking promises, she might be able to solve her problem by simply promising a concerned friend that she will henceforth deposit a certain percentage of her pay into a retirement fund.