Game theory is a mathematical study of decision-making in strategic situations. It is widely used in various fields, including economics, political science, biology, and psychology.

In game theory, players make decisions based on their understanding of other players’ decisions. A best response is a strategy that maximizes a player’s payoff given the strategies of other players. In this article, we will discuss how to write a best response in game theory.

## Understanding the Basics of Game Theory

To write a best response in game theory, it is essential to understand the basics of game theory. A game consists of players, actions, and payoffs. The players are the individuals or groups who make decisions; actions are the choices available to each player; payoffs are the outcomes or rewards associated with each combination of actions.

In game theory, there are two types of games: cooperative and non-cooperative games. In cooperative games, players work together to achieve a common goal and share the payoff equally. In contrast, non-cooperative games involve competition between players where each player aims to maximize their individual payoff.

## Calculating Best Response in Game Theory

To calculate a best response in game theory, we need to identify all possible strategies available to us and determine which one will give us our maximum payoff given our opponent’s strategy. For example, suppose you are playing rock-paper-scissors with your friend.

• Your possible strategies: Rock, Paper or Scissors
• Your friend’s possible strategies: Rock, Paper or Scissors

If your friend chooses rock as their strategy, what should be your best response? Your best response would be paper as it beats rock.

If your friend chooses paper as their strategy, what should be your best response? Your best response would be scissors as it beats paper.

Similarly for every possible strategy of your opponent, you should determine your best response.

## Writing a Best Response in Game Theory

When writing a best response in game theory, it is important to follow these steps:

### Step 1: Identify the Game

The first step is to identify the game you are playing. Describe the players, actions, and payoffs involved in the game.

### Step 2: Define Your Strategy Space

The next step is to define your strategy space. List down all possible strategies available to you.