Regarding your second question: the "game" in which a C student doesn't do their part in a group project and the A student has to decide whether to do all the w

Regarding your second question: the "game" in which a C student doesn't do their part in a group project and the A student has to decide whether to do all the work by him/herself or to accept that the C student will turn in crappy work and both will get a B. If you care less about the consequences of your action than the other part, you get an advantage. This is not really recommended as a negotiation strategy in the long run (it only works once, and the other person is now your enemy), but it's good to know it can happen.