You can put away your board games; we’re not here to talk about *that* kind of game theory. In this guide game theory refers to ** mathematical models exploring the behavior of competing rational agents. **Rational agents are persons or things who are intent on

**in a given scenario. Game theory can be a powerful analytical tool in situations wherein agents’ decisions influence others.’ Although initially applied to**

*selecting the optimal outcome***game theory has expanded to encompass all areas of the social sciences and beyond. Game on! Let’s learn about this idea.**

*zero-sum games in economic theory,**By analyzing questions, you can see patterns emerge, patterns that will help you answer questions. Qwiz5 is all about those patterns. In each installment of Qwiz5, we take an answer line and look at its five most common clues. Here we explore five clues that will help you answer a tossup on** game theory. ** *

__ZERO-SUM GAMES__

Zero-Sum Games refer to situations (games, relationships, business deals, etc.) involving two parties in which ** one party’s gain is the other party’s loss. **If one party loses and the other wins, the

__net__**Determining the optimal method to solve a zero-sum game was the foundation of game theory.**

*gain from the interaction is zero.*__JOHN VON NEUMANN__

John (born János) was a ** Hungarian polymath whose work was essential to the development of game theory. **Von Neumann’s wide-ranging intellectual interests included everything from quantum mechanics to economics, but he began to explore game theory in the late 1920s. Von Neumann proved the

**a fundamental theorem of game theory, in 1928. He would go on to write**

*minimax theorem,***with**

*Theory of Games and Economic Behavior***in 1944.**

*Oskar Morgenstern*__NASH EQUILIBRIUM__

John Nash was another one of the founding fathers of game theory. His namesake ** Nash equilibrium **is one of the most important principles of the discipline. In simple terms, Nash equilibrium can determine the optimal strategy in situations where players in a game are competing against each other with

**. So, in a state of Nash equilibrium**

*no incentive to change their initial strategy*

*no player has anything to gain by changing just their strategy if all other players’ strategies remain constant.*__STAG HUNT__

Not all game theory scenarios come from the 20th century. Eighteenth century French philosopher ** Jean-Jacques Rousseau** formulated a problem known as the “stag hunt.” In this hypothetical situation a pair of hunters must make a choice:

**Hunting a stag is tough work and requires a lot of cooperation, but the payoff is much bigger than catching a rabbit. Strategies for solving the problem are either**

*jointly hunt a stag or separately hunt two rabbits.***or**

*risk dominant***depending on what players prioritize. The stag hunt problem is often used to study**

*payoff dominant,*

*social cooperation.*__PRISONER’S DILEMMA__

One of the most famous game theoretic problems is the ** prisoner’s dilemma. **Two mathematicians from the RAND Corporation,

**and**

*Merrill Flood***, developed the foundation of the dilemma in the 1950s, but game theorist Alvin Tucker gave it its name. The typical prisoner’s dilemma is paradoxical in nature:**

*Melvin Dresher***In the classic example, two prisoners are encouraged to betray the other. If both remain silent, they will have minimal jail time.**

*each player acting in their own self-interest leads to a suboptimal outcome for the group.*

*If both betray each other (an action consistent with each prisoner acting in their personal interest) the total jail time for both is greater than in the first scenario.******

*Quizbowl is about learning, not rote memorization, so we encourage you to use this as a springboard for further reading rather than as an endpoint. Here are a few things to check out: *

Read

__this article__to learn more about von Neumann’s many intellectual achievements.Game theory doesn’t just apply to parlor games. It becomes even more important to understand when the stakes are higher -

__like nuclear weapons.__Nash Equilibrium can be a bit difficult to wrap your head around. This video shows a quick example of it.

If you think the prisoner’s dilemma is devious, just wait until you learn about the infinite prisoner's dilemma.

*Want to learn a ton more quizbowl information, compete on thousands of questions and generally have a blast this summer? ** *__Come Qwiz with us!__

*Questions? Have a great idea for a future Qwiz5? We'd love to hear from you! Email us at hello@qwizbowl.com*

*Love this Qwiz5? Don’t forget to subscribe for updates and share this with your friends through the links below!*

## 留言