Rachel is dating Nick. Nick's mom, Elenor, does not like Rachel. Rachel could either stay with Nick or leave Nick. Elenor could either approve or not approve.
Using the following game matrix, explain why <stay, don't approve> is not a nash equilibrium. Be sure to define nash equilibrium in your answer.
| | Approve | Don't approve |
|----------|---------|---------------|
| Stay | 20, 10 | -2, -5 |
| Leave | -5, 0 | 0, 5 |