Why words alone may not change a game
In game theory, “cheap talk” is communication that does not directly change the speaker’s options or impose a cost. A negotiator can promise to accept a deal, or a company can announce a future price, but the other side still has to decide whether to act on the message. If the speaker gains by making the promise and loses nothing by breaking it, the listener has reason to treat it cautiously.
The key issue is credibility, not whether the words sound sincere. A statement becomes more believable when it is connected to something that changes the speaker’s incentives: a contract, a deposit that can be forfeited, a public commitment that damages a reputation if broken, or an action that is difficult to reverse. Those consequences make following through more attractive—or reneging more costly.
When costless messages still matter
“Cheap” does not always mean useless. A message can help when the players’ interests overlap, as when both sides benefit from avoiding a costly misunderstanding. It can also convey information if different types of speakers have different reasons to say something. For example, a seller who knows more about a product may be more willing to make a verifiable claim about its condition if a false claim could later be exposed. The claim’s value then comes from the surrounding incentives, not from the words alone.
That distinction matters in bargaining and business. A promise may help coordinate expectations, but it cannot by itself guarantee cooperation. Before relying on one, ask what the speaker stands to gain from keeping it—and what, if anything, they stand to lose by breaking it.
