1. They both require more than one person.
2. They both involve people who are trying to further their own gains but are limited by the presence of another person.
3. They both offer the possibility of a “cooperative strategy,” in which two parties work together to come up with a reasonable solution, and a “noncooperative strategy,” where it’s every man for himself.
4. In both, the noncooperative option is often the most tempting, but could result in death, whereas the cooperative option is annoying, but rarely fatal.