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# Lessons from Ben Polak
- URL: https://www.antoinebuteau.com/lessons-from-ben-polak/
- Published: 2025-08-17T22:49:48.000Z
- Updated: 2026-09-05T03:27:11.000Z
- Description: Ben Polak, a Yale professor and leading authority on game theory and economic history, brings the fundamentals of strategic interaction into focus, inviting closer study of how choices depend on the incentives and actions of others.
- Author: Antoine Buteau
- Tags: Profile, Strategy, Finance & Economics Profiles

Ben Polak is the William C. Brainard Professor of Economics and Professor of Management at Yale University. His work spans decision theory, game theory, and economic history.

![Infographic for "Lessons from Ben Polak".](https://www.antoinebuteau.com/content/images/2026/07/b441d703-b480-409a-8225-e8e668c424ff-9262bf4d-cd39-4dd7-b430-4877fa05f901-optimized.webp)

## On the Fundamentals of Game Theory

1. Strategic situations are defined by interdependence: what happens to you depends partly on other people’s actions, not only your own. [*Source: Open Yale Courses — ECON 159, Lecture 1 transcript*](https://oyc.yale.edu/economics/econ-159/lecture-1?ref=antoinebuteau.com)
2. Analyze a game by making the players’ available actions and the objectives reflected in their payoffs explicit before predicting behavior. [*Source: Open Yale Courses — ECON 159, Lecture 1 transcript*](https://oyc.yale.edu/economics/econ-159/lecture-1?ref=antoinebuteau.com)
3. Game theory clarifies the consequences of specified objectives; it does not choose those objectives for the players. [*Source: Open Yale Courses — ECON 159, Lecture 1 transcript*](https://oyc.yale.edu/economics/econ-159/lecture-1?ref=antoinebuteau.com)
4. Use game theory both to make better strategic choices and to predict how people or organizations behave in strategic settings. [*Source: Open Yale Courses — ECON 159 course overview*](https://oyc.yale.edu/economics/econ-159?ref=antoinebuteau.com)

## On Rationality and Dominance

1. Do not choose a strictly dominated strategy: another available strategy gives you a better payoff regardless of what others do. [*Source: Open Yale Courses — ECON 159, Lecture 1 transcript*](https://oyc.yale.edu/economics/econ-159/lecture-1?ref=antoinebuteau.com)
2. The case against a strictly dominated strategy is direct: switching to the dominating option improves the payoff in every contingency. [*Source: Open Yale Courses — ECON 159, Lecture 1 transcript*](https://oyc.yale.edu/economics/econ-159/lecture-1?ref=antoinebuteau.com)
3. A strategy strictly dominates another when it yields a strictly higher payoff no matter what the other players do. [*Source: Open Yale Courses — ECON 159, Lecture 1 transcript*](https://oyc.yale.edu/economics/econ-159/lecture-1?ref=antoinebuteau.com)
4. Weak dominance is more delicate: one strategy does at least as well in every case and strictly better in some cases. [*Source: Open Yale Courses — ECON 159, Lecture 2 transcript*](https://oyc.yale.edu/economics/econ-159/lecture-2?ref=antoinebuteau.com)
5. Iterative deletion can simplify a game: after removing dominated strategies, reassess the reduced game because further strategies may become dominated. [*Source: Open Yale Courses — ECON 159, Lecture 3 transcript*](https://oyc.yale.edu/economics/econ-159/lecture-3?ref=antoinebuteau.com)
6. Individual rationality need not produce a collectively good outcome; the Prisoner’s Dilemma is the canonical warning. [*Source: Open Yale Courses — ECON 159, Lecture 1 transcript*](https://oyc.yale.edu/economics/econ-159/lecture-1?ref=antoinebuteau.com)
7. Price competition illustrates a Prisoner’s-Dilemma incentive: each firm may want to undercut even though mutual restraint would be better for both. [*Source: Open Yale Courses — ECON 159, Lecture 1 transcript*](https://oyc.yale.edu/economics/econ-159/lecture-1?ref=antoinebuteau.com)

## On Nash Equilibrium

1. A Nash equilibrium is a profile of choices in which every player’s choice is a best response to the others’ choices. [*Source: Open Yale Courses — ECON 159, Lecture 6 transcript*](https://oyc.yale.edu/economics/econ-159/lecture-6?ref=antoinebuteau.com)
2. Dominance can eliminate some choices before equilibrium analysis, but Nash equilibrium still requires checking each player’s best response. [*Source: Open Yale Courses — ECON 159, Lecture 3 transcript*](https://oyc.yale.edu/economics/econ-159/lecture-3?ref=antoinebuteau.com)
3. For a continuous choice problem, a best-response function can be found by maximizing the player’s payoff for each possible choice of the other player. [*Source: Open Yale Courses — ECON 159, Lecture 6 transcript*](https://oyc.yale.edu/economics/econ-159/lecture-6?ref=antoinebuteau.com)
4. Rationalizability asks which strategies can be justified as best responses to some beliefs about other players’ choices. [*Source: Open Yale Courses — ECON 159, Lecture 3 transcript*](https://oyc.yale.edu/economics/econ-159/lecture-3?ref=antoinebuteau.com)

## On Different Types of Games and Strategies

1. In a sequential game, backward induction starts at the final decision points and works back through the game tree. [*Source: Open Yale Courses — ECON 159, Lecture 13 transcript*](https://oyc.yale.edu/economics/econ-159/lecture-13?ref=antoinebuteau.com)
2. Mixed strategies model deliberate randomization, with applications in sports and in audit or enforcement settings. [*Source: Open Yale Courses — ECON 159, Lecture 10 transcript*](https://oyc.yale.edu/economics/econ-159/lecture-10?ref=antoinebuteau.com)
3. Evolutionary stability studies whether a strategy can persist in a population when challenged by alternatives. [*Source: Open Yale Courses — ECON 159, Lecture 11 transcript*](https://oyc.yale.edu/economics/econ-159/lecture-11?ref=antoinebuteau.com)
4. The hawk–dove model makes the trade-off between the value of a contested resource and the cost of fighting explicit. [*Source: Open Yale Courses — ECON 159, Lecture 12 transcript*](https://oyc.yale.edu/economics/econ-159/lecture-12?ref=antoinebuteau.com)
5. Imperfect-information games use information sets to represent decision points a player cannot distinguish. [*Source: Open Yale Courses — ECON 159, Lecture 18 transcript*](https://oyc.yale.edu/economics/econ-159/lecture-18?ref=antoinebuteau.com)
6. Repeated interaction can make cooperation sustainable when future rewards and credible punishment strategies change current incentives. [*Source: Open Yale Courses — ECON 159, Lecture 22 transcript*](https://oyc.yale.edu/economics/econ-159/lecture-22?ref=antoinebuteau.com)
7. Asymmetric-information models examine strategic choices when players have different information, including signaling and adverse-selection problems. [*Source: Open Yale Courses — ECON 159 course overview*](https://oyc.yale.edu/economics/econ-159?ref=antoinebuteau.com)

## On Strategic Thinking and Decision Making

1. Strategic thinking requires modeling other players’ incentives and anticipating the choices those incentives make attractive. [*Source: Open Yale Courses — ECON 159, Lecture 1 transcript*](https://oyc.yale.edu/economics/econ-159/lecture-1?ref=antoinebuteau.com)
2. Higher-order reasoning, as in the two-thirds-average game, depends on what you expect others to expect about rationality. [*Source: Open Yale Courses — ECON 159, Lecture 2 transcript*](https://oyc.yale.edu/economics/econ-159/lecture-2?ref=antoinebuteau.com)
3. In timing games such as a duel, the strategic question may be when to act rather than which action to take. [*Source: Open Yale Courses — ECON 159, Lecture 16 transcript*](https://oyc.yale.edu/economics/econ-159/lecture-16?ref=antoinebuteau.com)
4. Patience can be strategically valuable when acting earlier is dominated by waiting for a more favorable point in the game. [*Source: Open Yale Courses — ECON 159, Lecture 16 transcript*](https://oyc.yale.edu/economics/econ-159/lecture-16?ref=antoinebuteau.com)
5. Commitment works only when it changes the other side’s incentives and makes a future action credible. [*Source: Open Yale Courses — ECON 159, Lecture 13 transcript*](https://oyc.yale.edu/economics/econ-159/lecture-13?ref=antoinebuteau.com)
6. A dominance argument is robust when the same choice is better under every relevant contingency. [*Source: Open Yale Courses — ECON 159, Lecture 1 transcript*](https://oyc.yale.edu/economics/econ-159/lecture-1?ref=antoinebuteau.com)

## On the Broader Applications and Implications of Game Theory

1. Game theory models both competitive and cooperative economic settings; Cournot competition is one course example of strategic interaction between firms. [*Source: Open Yale Courses — ECON 159, Lecture 6 transcript*](https://oyc.yale.edu/economics/econ-159/lecture-6?ref=antoinebuteau.com)
2. Iterative deletion can be used to analyze policy-position competition; the course applies it to the median-voter theorem. [*Source: Open Yale Courses — ECON 159, Lecture 3 transcript*](https://oyc.yale.edu/economics/econ-159/lecture-3?ref=antoinebuteau.com)
3. Game theory can be applied to evolution, including strategic behavior in biological populations. [*Source: Open Yale Courses — ECON 159, Lecture 1 transcript*](https://oyc.yale.edu/economics/econ-159/lecture-1?ref=antoinebuteau.com)
4. The course identifies law as an important application area for game-theoretic reasoning. [*Source: Open Yale Courses — ECON 159, Lecture 1 transcript*](https://oyc.yale.edu/economics/econ-159/lecture-1?ref=antoinebuteau.com)
5. Sports offer useful examples of strategic interaction and mixed-strategy reasoning. [*Source: Open Yale Courses — ECON 159, Lecture 10 transcript*](https://oyc.yale.edu/economics/econ-159/lecture-10?ref=antoinebuteau.com)
6. Cooperation in repeated games must be incentive-compatible; credible future consequences can sustain it. [*Source: Open Yale Courses — ECON 159, Lecture 22 transcript*](https://oyc.yale.edu/economics/econ-159/lecture-22?ref=antoinebuteau.com)

## Learnings from His Research and Academic Work

1. Ben Polak’s Yale profile identifies work across decision theory, game theory, and economic history. [*Source: Yale School of Management — Benjamin Polak faculty profile*](https://som.yale.edu/faculty-research/faculty-directory/benjamin-polak?ref=antoinebuteau.com)
2. Polak’s work studies economic agents with goals richer than those captured in traditional models. [*Source: Yale School of Management — Benjamin Polak faculty profile*](https://som.yale.edu/faculty-research/faculty-directory/benjamin-polak?ref=antoinebuteau.com)
3. His game-theory research includes foundational theoretical work on common knowledge. [*Source: Yale School of Management — Benjamin Polak faculty profile*](https://som.yale.edu/faculty-research/faculty-directory/benjamin-polak?ref=antoinebuteau.com)
4. His Yale profile also notes contributions to the theory of repeated games with asymmetric information. [*Source: Yale School of Management — Benjamin Polak faculty profile*](https://som.yale.edu/faculty-research/faculty-directory/benjamin-polak?ref=antoinebuteau.com)
5. Other listed research interests include economic inequality and how individuals respond to uncertainty. [*Source: Yale School of Management — Benjamin Polak faculty profile*](https://som.yale.edu/faculty-research/faculty-directory/benjamin-polak?ref=antoinebuteau.com)
6. His Yale profile describes an empirical project on industrial organization during England’s Industrial Revolution. [*Source: Yale School of Management — Benjamin Polak faculty profile*](https://som.yale.edu/faculty-research/faculty-directory/benjamin-polak?ref=antoinebuteau.com)
7. Strategic analysis should replace intuition with explicit reasoning about players, actions, incentives, and interdependence. [*Source: Open Yale Courses — ECON 159, Lecture 1 transcript*](https://oyc.yale.edu/economics/econ-159/lecture-1?ref=antoinebuteau.com)