The example with which Pigou opens his discussion of "uncharged disservices" is not, as I have indicated, the case of the smokey chimney but the case of the overrunning rabbits: "...incidental uncharged disservices are rendered to third parties when the game-preserving activities of one occupier involve the overrunning of a neighbouring occupier's land by rabbits..." This example is of extraordinary interest, not so much because the economic