I came across this word/concept when reading a philosophical book but I cannot remember where.
It basically means if only a few people do something its ok, but if everyone does it it becomes bad for everyone.
For example a good fishing hole. If only I or a few others go there, everyone benefits. If everyone goes then there are no fish and everyone loses.
The word has a meaning to do with reaching some tipping point. If a few are firemen, that's great, but if everyone was a fireman that's bad as nothing else will get done.
Best Answer
I think you mean "the tragedy of the commons". From Wikipedia: