  As was noted in   §2.1.2,  for the concretist, there is no special property of the actual world  — actuality — that distinguishes it, in any  absolute sense, from all of the others; it is simply the world that  we inhabit. For abstractionists, however, actuality  is a special property that distinguishes exactly one  possible world from all others — the actual world is the only  world that happens to obtain; it is the one and only way  things could be that is the way things as a whole, in fact,  are. However, for most abstractionists, the distinctiveness  of the actual world does not lie simply in its actuality but in its  ontological comprehensiveness: the actual world encompasses all that  there is. In a word: most abstractionists are actualists. 