The Prisonerâ€™s Dilemma is a classic Game Theory problem and is most commonly used to introduce the ideas of it.

Confess | Deny | |
---|---|---|

0 | 3,3 | 1,10 |

1 | 10,1 | 2,2 |

Each number represents the amount of years either P1 or P2 will go away for. The rational decision is for both to deny and minimize the risk.

The two prisoners have two choices either to confess or deny. Let's use Python to calculate the payoff.

```
a = np.array([[0, 1], [1, 0]])
np.linalg.det(a)
```

If P1 confesses but P2 does not. The determinant is = -1.

```
a = np.array([[1, 0], [0, 1]])
np.linalg.det(a)
```

If P1 denies but P2 confesses. The determinant is = 1.

```
a = np.array([[0, 1], [0, 1]])
np.linalg.det(a)
```

If both deny, then determinant is 0.

```
a = np.array([[1, 0], [1, 0]])
np.linalg.det(a)
```

If both confess, then the determinant is 0.

The dominant strategy is to "deny".