# What Is Dominance Strategy in Game Theory?

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Jane Flores

Dominance strategy is a critical concept in game theory that helps to determine the optimal course of action for players in various games. In simple terms, a dominance strategy is a set of actions that a player can take which ensures that they always do better than their opponent, irrespective of the opponent’s moves. This article will provide an in-depth overview of what dominance strategy is, how it works, and its practical applications.

## What Is Game Theory?

Game theory is a branch of mathematics that deals with decision-making in scenarios where multiple players are involved. It provides a framework for analyzing the behavior and decision-making of rational individuals in strategic settings. Game theory has numerous real-world applications ranging from economics to political science, biology, psychology, and more.

## What Is Dominance Strategy?

Dominance strategy refers to the optimal course of action available to a player in a game where one strategy dominates over all other possible strategies regardless of what the opponent does. In other words, it is the best response that leads to an outcome where the player always does better than their opponent.

### Dominant Strategy

A dominant strategy is one where no matter what an opponent does or how they behave; it remains optimal for one player to choose that strategy. For instance, let’s consider a simple example where two players are involved in a game – Player A and Player B.

Both players have two strategies: Strategy 1 and Strategy 2. The payoffs for each combination are as follows:

Player A / Player B | Strategy 1 | Strategy 2
—|—|—
Strategy 1 | (3, 4) | (0, 0)
Strategy 2 | (1, 2) | (5, 3)

In this scenario, we can observe that when Player A chooses Strategy 1, they get a higher payoff than when they choose Strategy 2, regardless of the strategy Player B chooses. Similarly, when Player B chooses Strategy 2, they get a higher payoff than when they choose Strategy 1, regardless of what Player A chooses. Thus, in this case, Strategy 1 is a dominant strategy for Player A and Strategy 2 is a dominant strategy for Player B.

### Nash Equilibrium

A Nash equilibrium is a situation where each player’s strategy is optimal given the other player’s strategy. It represents a stable solution where neither player has an incentive to change their choice of strategy. In the example above, the Nash equilibrium occurs when both players choose Strategy 1.

## Practical Applications of Dominance Strategy

Dominance strategy has numerous real-world applications ranging from economics to political science, biology, psychology, and more. For instance, dominance strategy can be used to analyze situations where businesses are competing for market share or resources. By identifying the dominant strategies available to each business, it becomes easier to predict and understand their behavior in competitive markets.

Similarly, dominance strategy can be applied in politics where candidates compete for votes during elections. By identifying the dominant strategies available to each candidate, it becomes easier to predict their behavior during election campaigns and debates.

### Conclusion

In conclusion, dominance strategy is a critical concept in game theory that helps players determine the optimal course of action available to them in various games. It provides a framework for analyzing decision-making and behavior in strategic settings such as economics and politics. By identifying dominant strategies and Nash equilibria in various scenarios, players can make informed decisions that lead to better outcomes for themselves.