In the example you've given the group is defining what is best and what is not; you doing what is best for you is defined by only you. Here's a better explanat

In the example you've given the group is defining what is best and what is not; you doing what is best for you is defined by only you. Here's a better explanation of the concept: https://en.m.wikipedia.org/wiki/Nash_equilibrium https://en.m.wikipedia.org/wiki/Nash_equilibrium