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Commitment Device Identification

Why It Matters

The gap between intentions and actions is vast. People's stated preferences diverge from revealed preferences; promises are broken; resolutions fail. Commitment devices are how you make communication credible despite this gap. Recognizing when someone has actually committed (versus merely claimed to) is essential for trust calibration.

The Key Move

For any promise or claim, ask: what would prevent the sender from changing their mind later? Is there a penalty for deviation? Is there monitoring? Has something irreversible been done? If you can't identify a commitment mechanism, treat the promise as unreliable regardless of sincerity.

Classic Application

Burning ships. Cortés supposedly burned his ships after landing in Mexico, eliminating the option of retreat. This committed his forces to victory or death, signaling resolve to both his men (increasing their commitment) and the Aztecs (changing their strategic calculation). Whether or not the story is historically accurate, the logic is sound: destroying your own options is a credible signal of commitment.

Surprising Application

Public goal announcements with accountability buddies. When you tell someone your goal and ask them to check on your progress, you've created a commitment device. Deviation now costs you reputation with that person. This is why public commitments work better than private ones - not because you're more sincere, but because you've bound yourself to social consequences. The mechanism matters more than the motivation.

Failure Modes

  • Assuming commitment devices always work: they only work if the commitment cost exceeds the temptation to defect. Weak commitment devices fail.

  • Confusing sunk costs with commitments: having already spent resources doesn't commit you to future actions (sunk cost fallacy). Only mechanisms that change future payoffs create commitment.

  • Overcommitting: commitment devices reduce flexibility. In uncertain environments, retaining options has value. Premature commitment can be worse than no commitment.

Go Deeper

  • Schelling, The Strategy of Conflict - Chapter 2 on commitment tactics
  • Elster, Ulysses Unbound - philosophical and psychological treatment of commitment