 One idealizion here of the situations described is that the costs and benefits of cooperation are assumed to be independent of the number of those who cooperate. Until the threshold of cooperation is exceeded, nobody gets the benefit. Afterwards, everyone does. They are, in the terminology of Frolich et al, lumpy. This is not true of, say, a lake made clean when residents refrain from dumping waste into it, or a gas supply maintained by users' conservation. We will consider relaxing this idealization later. For now, note that a situation more closely mirrored by the matrix is faced by the supporters of a particular political candidate or proposition who face the choice of whether to vote in a majority-rule election. Once enough supporters to constitute a majority choose to vote, additional votes will not increase their benefit. For this reason we might call the game described by the matrix above a voting game. 