Definition
Commitment device is a pre-arranged constraint that binds the future self to a desired behavior. The choice is removed from the moment of execution and handled earlier, when motivation is fresher and the temptation is abstract. Examples include automatic transfers to savings, scheduled appointments with consequences, locked apps, prepaid classes, deleted accounts, public stakes.
The history of the idea is old — Odysseus tying himself to the mast is a commitment device — but the modern formulation treats it as a design tool. The future self is treated as a separate agent whose interests and reliability cannot be fully trusted, and constraints are installed to protect against it.
Why it matters
How it works
The cost structure of most temptations is asymmetric: the reward is immediate, the cost is distant. The future self in the moment of choice systematically over-weights the immediate side. A commitment device closes the loophole by making the moment-of-choice less free — either by raising the cost of the wrong action or by removing it as an option.
Devices range from soft to hard. A soft device makes the wrong action mildly inconvenient — phone in another room. A medium device adds a social or financial cost — telling a friend, putting money on the line. A hard device removes the option — uninstalled app, no alcohol in the house, automated payment. The right strength depends on how unreliable the future self has been: if the unwanted behavior keeps winning, the device is not strong enough yet.