Reference · Cheat Sheet 07
Commitment & Credibility
Core rule: a threat or promise is credible only if carrying it out is in your interest when the moment comes. Commitment makes it so — by removing your option to do otherwise. Fewer options can mean a better outcome.
The credibility test — all three must hold
- Observable? The other side can verify the commitment exists — it's public, visible, or in writing.
- Hard to reverse? Backing out is genuinely costly: legal exposure, reputational damage, or a structural impossibility.
- Changes your best move? Following through is now your rational choice if challenged — not just your stated intention.
If any of these fails, the "commitment" is cheap talk — the other side can safely ignore it.
The commitment toolkit
- Burn the bridge. Close the fallback so retreating is not an option. Forces you forward — and signals that credibly to the other side.Example: a no-exceptions refund policy on your course; Cortés scuttling the ships.
- Binding contract. Legally enforceable terms make reneging genuinely costly. The contract does the commitment work, not your word.Example: signed sponsorship agreement with penalty clause for price change.
- Public pledge. Announced to a large audience, backing down costs reputation. The larger the audience, the stronger the commitment.Example: "best & final" course price sent simultaneously to all sponsors.
- Delegate to a rule or third party. A fixed policy enforced by others removes your discretion in the moment. "My policy is X" is credible when the rule is real and verifiable.Example: published fixed pricing page your team enforces without exceptions.
- Sunk investment. Pre-spending changes your future incentives visibly. You now have to follow through to recoup the investment.Example: pre-investing in equipment or ad spend that only pays off if you compete aggressively.
- Reputation across repeated dealings. A track record of following through functions as a commitment device — reneging now costs you in future rounds. (→ Lesson 08: Repeated Games)Example: referrer relationships, annual course sponsorships, hospital contracts.
The entry game — commitment changes everything
Before commitment: incumbent accommodates if you enter → you enter, incumbent earns 5
| Fight | Accommodate |
|---|
| You Enter | You: −2 · Inc: 2 | You: 4 · Inc: 5 ← incumbent's best move |
|---|
| You Stay Out | You: 0 · Inc: 8 | You: 0 · Inc: 8 |
|---|
After commitment: Fight payoff rises 2→6 → incumbent fights if you enter → you stay out → incumbent earns 8
| Fight | Accommodate |
|---|
| You Enter | You: −2 · Inc: 6 ← incumbent's best move now | You: 4 · Inc: 5 |
|---|
| You Stay Out | You: 0 · Inc: 8 | You: 0 · Inc: 8 |
|---|
Backward-induct: Fight (6) > Accommodate (5) → you foresee a fight → Stay Out (0) > Enter (−2) → entry deterred. Incumbent earns 8 by giving up the option to accommodate.
The double edge — caution
- Inflexibility: commitment locks you in even when circumstances change. Commit only when the payoff structure genuinely rewards it.
- Brinkmanship: if both sides over-commit to incompatible positions, the game can lock into a collision neither wanted. Know when to leave an exit.
- Commit to the right thing: commitment amplifies whatever you've locked in. Check the payoff structure before you burn the bridge.
Quick reference — the commitment question
Before committing, ask: (1) Is the payoff structure such that my committed action is better than backing down if challenged? (2) Can I make this observable and hard to reverse? (3) Is the world stable enough that locking in now won't become a liability?
If yes to all three — commit. If not — don't confuse posturing with strategy.