New research | Solid outcomes in finite games
In their article in the Journal of Economic Theory, Professor Jörgen Weibull, and co-authors introduce a concept they call “solid outcomes.” It’s designed to improve predictions in situations where different individuals, companies or organizations interact and each tries to make the best possible move, knowing others are doing the same.
In economics and related fields, this kind of situation is studied using game theory and also this study uses game theory. But many traditional methods have a problem: they often give too many possible outcomes or are overly sensitive to small, irrelevant details in how a situation is described. As a result, they can be hard to apply when trying to understand and predict real-world behavior.
The new approach avoids these issues. Solid outcomes are stable, consistent, and can be calculated efficiently. They are invariant under strategically irrelevant transformation of the game. The approach is a refinement of Nash equilibrium and is expressed in terms of observable outcomes rather than in strategies.
In short, the idea of solid outcomes offers a more reliable and precise way to anticipate what people will do when their decisions depend on one another.
