What it means
In the one-off version of the game, each player does best by betraying the other, no matter what the other does. Both then end up worse off than if they had cooperated, which is the puzzle that made the game famous.
Real businesses rarely meet each other only once, though, which is why the repeated version is closer to life. When the game repeats, today's choices affect tomorrow's.
A player who betrays now may be betrayed in return later, so the short-term gain from cheating has to be weighed against the loss of future cooperation. If the players expect to keep dealing with each other, cooperation can become the rational choice.
In the early 1980s the political scientist Robert Axelrod ran computer tournaments in which different strategies played each other many times. The winner was a very simple strategy called tit for tat, submitted by Anatol Rapoport.
It cooperates on the first round and then copies whatever the other player did on the previous round. The lessons that came out of the tournaments have been widely applied.
Successful strategies tended to be nice, meaning they never betray first, but also retaliatory, so cheating is punished immediately. They were forgiving, returning to cooperation after one round of punishment, and they were clear, so the other player could understand them.
For managers, this explains many everyday patterns. Supplier relationships, joint ventures, price competition between rivals and even negotiations with staff all contain a repeated dilemma.
Reputation, contracts and regular meetings make it easier for both sides to cooperate. The model has limits.
Real people make mistakes, misread signals and cannot always observe each other's actions, so strict tit for tat can lock two parties into a cycle of retaliation. Many analysts therefore prefer a slightly more forgiving version when errors are likely.
In practice
Real-world examples.
Example
Two regional airlines serve the same routes and could each cut fares to win customers. If both cut, profits fall for both, and they know they will compete again every season. They hold their prices roughly steady, and each watches the other's fares closely so that any cut is matched immediately.
Example
A manufacturer and its main supplier negotiate contracts every year. The supplier could cut quality slightly to save money, but the buyer would notice and take its orders elsewhere next year. The prospect of future orders keeps the supplier honest.
Example
Two start-up founders share office space and take turns hosting visiting clients. If one stops contributing, the other gradually stops too, and the arrangement collapses. Both therefore make a point of doing their share and talk when something feels unfair.
Formula
Calculation
Total payoff = sum of the payoffs from each round
The standard payoffs satisfy temptation > reward > punishment > sucker, and twice the reward must exceed temptation plus sucker. Suppose two companies decide each month whether to keep a price agreement. Payoffs per round are: temptation $5,000 (you cheat while the other cooperates), reward $3,000 (both cooperate), punishment $1,000 (both cheat), and sucker $0 (you cooperate while the other cheats). Over 10 rounds, two tit-for-tat players each earn 10 x 3,000 = $30,000. Two permanent cheaters each earn 10 x 1,000 = $10,000. If a tit-for-tat player meets a permanent cheater, the cheater earns 5,000 + 9 x 1,000 = $14,000 and the tit-for-tat player earns 0 + 9 x 1,000 = $9,000. Cheating wins against a cooperator, but cooperating pairs earn far more than cheating pairs.Case study
Seen in the real world.
Harlow and Finch Wholesale is an illustrative, fictional distributor that buys fruit from a handful of growers. Every season the growers could sell their best produce to a competitor at a higher price, leaving Harlow and Finch with the second-grade fruit.
The finance director realised that the relationship was a repeated game. She suggested a simple policy: pay promptly, share demand forecasts early and match any competing offer on the best produce. If a grower sold the best fruit elsewhere, the distributor would give that grower smaller orders the following season.
Within two seasons, the growers stopped playing the buyers off against one another, and quality improved. The illustrative lesson is that cooperation lasted because the rules were clear, the punishment was proportionate and a return to normal dealing was always possible.
Watch out
Common mistakes.
- Treating the one-off dilemma as if it described all business relationships, when most business dealings repeat and reward cooperation.
- Assuming cooperation always wins, when a strategy that never retaliates can be exploited by cheaters.
- Expecting the model to predict real behaviour exactly, when people make mistakes, misjudge signals and sometimes act from emotion.
Questions
People also ask.
What is tit for tat?
A strategy that cooperates in the first round and then copies the other player's previous move.
Why does a known end date matter?
If both players know the last round, each is tempted to cheat in it, and the temptation can spread back to earlier rounds, so cooperation weakens.
How is this used in business?
It informs the design of contracts, loyalty schemes, supplier relationships and competitive strategy, where repeated dealing makes trust valuable.
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