This doesn't feel like either of those, to me.
Tragedy of the commons and NIMBY seem like they have symmetric Nash equilibria where the total payoff is terrible. In the farmer's dilemma, the Nash equilibria are asymmetric, at D/C and C/D, and these are optimal in terms of total utility, but they're unfair.
This thread is for asking any questions that might seem obvious, tangential, silly or what-have-you. Don't be shy, everyone has holes in their knowledge, though the fewer and the smaller we can make them, the better.
Please be respectful of other people's admitting ignorance and don't mock them for it, as they're doing a noble thing.
To any future monthly posters of SQ threads, please remember to add the "stupid_questions" tag.