I think a basic overview of game theory should also discuss Pareto optimality to some extent. You can have 100% of participants operating in a locally-ideal way while still creating problems in aggregate.
Pareto efficiency is a welfare economics concept. In game theory, the closest you can get to that is a Nash equilibrium.
Tragedy of the commons / bounded rationality for example.
https://en.wikipedia.org/wiki/Tragedy_of_the_commons